analyze the given code

For I = 1 to n

For j = 1 to n

C =[i.j] = 0

For k=1 to n

C[i.j] = c [i.j] + a[i.k] * b[k.j]

End

End

end

Answers

Answer 1

Answer:

Following are the description to the given code:

Explanation:

In the given code, three for loop are used that uses the variable "I, J, and K", which starts from 1 and ends when it equal to the value of the "n".

Inside the "I and J" loop, another variable "C" is defined, which uses "i,j" and assign a value, that is equal to 0. In the "k" loop, it uses the "c[i.j]" to multiply the value of "a[i.k] and b[k.j]".

In other words, we can say, it calculates the multiplication of the matrix and stores its calculated value.


Related Questions

Expain the application areas of ICT in education sector and E-commerce​

Answers

Explanation:

Nowadays almost all the school and college use computers in classrooms and labs to teach students.A teacher can teach effectively using computer-based presentations.Students can study different subjects and complete their assignment by using different software in computer.The Computer Based Training(CBT) and Web Based Training(WBT) are aid to teach the student in the classroom.

E-commerce is a financial business transaction conducted electronically between business partners over the internet.Business transactions can occur very quickly and globally.The people can buy,sell and exchange the products or services using internet.Todays many computer can also access the Internet through wireless technologies.

When should the architect begin the analysis?

Answers

Answer:

Right after the end user and the customer finalize the negotiations.

Explanation:

The architect's analysis is extremely important to ensure that a system acts correctly and efficiently. This analysis is carried out together with the implementation of codes and security systems, which will be responsible for the defense of the system. This analysis should begin immediately after the end user and the customer have completed negotiations that define all the requirements and information necessary to start the project.

When you want to use the current backup of all of the files, which option should be selected?

Answers

Answer:

To use the current backup of all the files, the option to select is Browse for Folders.

This gives you access to select the most current back up with the latest timestamp.

Cheers!

Which type of cryptographic algorithm takes an input string of any length, and returns a string of any requested variable length?

Answers

Answer:

The correct solution is "Sponge ".

Explanation:

The method of transforming data into unreadable text is synonymous with cryptography, as well as vice-versa.The sponge configuration throughout cryptography seems to be a method of thought, based on a specific-length possible combination as well as a formatting law, which constructs a mechanism connecting variable-length information through variable-length release.

what is the purpose of social networking sites

Answers

Explanation:

social networking sites allow users to share ideas, digital photos and videos, posts, and to inform others about online or real world activities and events with people in their network.

A computer has 38 address lines. How many locations in Mega bytes can it address?

Answers

Answer:

The computer can address 34359,738368 megabytes

Explanation:

Given

Address Lines (n) = 38

Required

Determine the number of location it can address

Number of addressable locations (N) in bits is calculated as thus

[tex]N = 2^n.[/tex]

Substitute 38 for n

[tex]N = 2^{38}[/tex]

[tex]N = 274877906944\ bits[/tex]

Next; is to convert from bits to megabytes

Start by converting to bytes

1 bit = 0.125 bytes;

So;

[tex]N = 274877906944 * 0.125\ bytes[/tex]

[tex]N = 34359738368\ bytes[/tex]

Convert from byte to megabyte

[tex]1\ byte = 10^{-6}\ megabyte[/tex]

So;

[tex]N = 34359738368\ * 10^{-6}\ MB[/tex]

[tex]N = 34359,738368\ MB[/tex]

Hence, the computer can address 34359,738368 megabytes

When a hardware or software interrupt occurs, the CPU calls________

Answers

Answer:

Operating system

Explanation:

An interrupt is the signal sent to the processor that interrupts the current process. It may be generated by a hardware device or a software program.With each interrupt the CPU hardware does exactly the same thing, which is what enables operating systems to take control of the current user operation.

What is Game Theory?
Study of strategic decision making
elements of support for effective support of a system
the imitation of the operation of real-world process or system over time
decentralized communications model

Answers

Answer:

the branch of mathematics concerned with the analysis of strategies for dealing with competitive situations where the outcome of a participant's choice of action depends critically on the actions of other participants

Explanation:

In simple terms Game theory is the study of how and why people make decisions.

Multiple Choice
Choose the answer that best answers the question.
Read the following sentence. The underlined phrase is an idiom that uses figurative language. What could this phrase mean?
When you work on your project, you shouldn't bite off more than you can chew by working on too much at one time.
O A Don't talk with food in your mouth.
O B. Don't do more than you can handle.
c. Don't eat too much food,
D. Don't eat someone else's food.

Answers

Answer:

dont do more then you handle

The user documents are stored in _______ format.

Answers

The user documents are stored in _______ format.

A. qvd.

B.  qvw

C.  None of the options

D.  qvs.

Answer:

B.  qvw

Explanation:

Given the options available, it can be inferred that the application the question is referring to is called QlikView which is a software application that is used for analytics explanation. This software applications saves documents created in a file extension specifically known as "QVW."

Hence, the right answer is that: in QlikView, the user documents are stored in QVW format.

The user documents are stored in QVW format.

It may well be deduced that perhaps the program referred to something throughout the question would be QlikView, a software platform utilized for analytics explanations or presentations.QVW documents seem to be QlikView layout software consisting incorporate presentations, charts, leading components, load scripts, expressions, as well as workplaces used in information displays.

Thus the above answer is right.

Learn more about the QVW format here:

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Amanda a recently moved into a new home. Everyone has their own tablet, and wants to connect to the same network, no matter where they are in the house. Which type of network is best for Amanda and her family?nd her family recently moved into a new home. Everyone has their own tablet, and wants to connect to the same network, no matter where they are in the house. Which type of network is best for Amanda and her family?

Answers

Answer:

wifi is the best network for all, As it gets in all corners of the house.

Which of the following are offered by most
professional organizations? Check all of the boxes
that apply.
a code of conduct
access to resources, conferences, and job
boards
help with troubleshooting computer issues
skills validation

Answers

Answer:

1. A code of conduct

2. Access to resources, conferences,and, job boards

4. skills validation

Explanation:

I just answered it

A code of conduct is a collection of regulations describing an individual party's or organization's norms, standards, and duties or right procedures. The correct options are A, B, and D.

What is a code of conduct?

A code of conduct is a collection of regulations describing an individual party's or organization's norms, standards, and duties or right procedures. The most prevalent policy within a company is a code of conduct. This policy outlines the company's beliefs, standards, and moral and ethical expectations for workers and third-party interactions with the firm.

From the given set of options, the options that are offered by most professional organizations are,

A code of conductAccess to resources, conferences, and job boardsSkills validation

Hence, the correct options are A, B, and D.

Learn more about the Code of Conduct here:

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Check
Which of these tasks can be accomplished when the drop-down menu of the Bullets icon is clicked? Check all that
apply.

Answers

Which of these tasks can be accomplished when the drop-down menu of the Bullets icon is clicked? Check all that

apply.

Indent the ideas in the bulleted list.

Change the number level of the list.

Choose the bullet to be used in the list.

Define the new bullet to be used in the list.

Pick the number format to be used in the list.

Answer:

Choose the bullet to be used in the list.

Define the new bullet to be used in the list.

Explanation:

When using Microsoft Word text editor, when the drop-down menu of the bullet icon is clicked, the following tasks can be accomplished which are to choose the bullet to be used in the list and define the new bullet to be used in the list.

A bullet is used to identify or list out important items, sometimes in ascending order, and are used to organize information to make the important points easy to pick out.

Answer:

Choose the bullet to be used in the list.

Define the new bullet to be used in the list.

Explanation:

.

What is a characteristic of maintaining logs in a system? A. Logging prevents security violations, but only deals with passive monitoring. B. Logging provides access control by authenticating user credentials. C. Logging helps an administrator to detect security breaches and vulnerable points in a network

Answers

Answer:

The correct answer is C

Explanation:

When analysed, logs can help to forestall security breaches to a network it can also help to identify and resolve any vulnerabilities within the system.

Due to the number of logs generated daily, it is almost impracticable to constantly monitor all logs generated by the system.

Cheers!

Which section from the article BEST explains why humans could benefit from studying a particular type of extremophile?​

Answers

Answer:

The study of extremophiles provides an understanding of the physicochemical parameters defining life on Earth and may provide insight into how life on Earth originated. The postulations that extreme environmental conditions existed on primitive Earth and that life arose in hot environments have led to the theory.­NASA is studying an extremophile, Deinococcus radiodurans, which is extremely resistant to radiation. This microbe can withstand doses of radiation 500 percent higher than would be lethal to humans.

Hope this helped you!

Explanation:

what is the principle that producers are entitled to make more money from a business than they invest

Answers

Answer: profit motive

Explanation: i don’t have and explanation but i just did it on apex and got it right

You are configuring two PCs for your network, PC-A is given an IP address of 192.168.1.18 and PC-B is given an IP address of 192.168.1.33. Both PCs receivces a subnet mask of 255.255.255.240A) what is network address of PC-A?B) what is network address of PC-B?C) will these PCs be able to communicate directly wiyh each other?D) what is the highest address that can be given to PC-B that allows it to be on the same network as PC-A ?

Answers

Answer:

Explanation:

a) 192.168.1.16

b) 192.168.1.32

c) No

d) 192.168.1.30

Answer:

It’s somethint

Explanation:

Mention five specific techniques you can use to improve your written documents.

Answers

Answer:

The answer is below

Explanation:

There are various techniques an individual can use to improve his or her written documents, some of which considered to be specific are:

1. Understand the targeted readers.

2. Do not be ambiguous or avoid ambiguity

3. Always use active voice pattern whenever possible

4. Perform second reading, and edit where necessary

5. Avoid repetition of words too often.

Which of the following is no longer necessary when you use HTML5 to develop Webpages? Please Hurry This Is For An Assignment due in 15 minutes :>

Answers

Answer:

Installing a third-party plug-in to include video

Explanation:

Which of the following best describes how computing devices represent information? A. A computer will either represent information as bits or bytes but not both B. A computer represents data as a byte which is either a 0 or a 1 C. A computer represents data as bits which is either a 0 or a 1 D. A computer represents information as bits which contain 8 bytes.

Answers

Answer:

The Answer is B

Explanation:

The reason the answer is B is because "bytes" are the correct form of storing memory in 0's and 1's.

Using concepts of data representation in a computer, it is found that the correct option is:

C. A computer represents data as bits which is either a 0 or a 1.

-----------------

In computer science, it is a common saying that "everything inside a computer is either a 0 or 1".The unit of measure that only has 0s and 1s is bits.If we load a file, either text or image, all the values at each position on the file are composed by 0's and 1's, for example.Thus, option C is correct.

A similar problem is given at https://brainly.com/question/17399642

Order the steps for using the Rules Wizard to create an email rule.

Answers

Answer:

The answer is in the attached file below.

Explanation:

Java Programming home > 1.14: zylab training: Interleaved input/output Н zyBooks catalog Try submitting it for grading (click "Submit mode", then "Submit for grading"). Notice that the test cases fail. The first test case's highlighting indicates that output 3 and newline were not expected. In the second test case, the-5 and newline were not expected 2 Remove the code that echoes the user's input back to the output, and submit again. Now the test cases should all pass 0/2 ACTIVITY 1.14.1: zylab training: Interleaved input/output DoubleNum.java Load default template 1 import java.util.Scanner; 3 public class DoubleNum public static void main(String args) { Scorner sehr = new Scanner(System.in); int x; 7 System.out.println("Enter x: "); 9 - scnr .nextInto: 10 11 System.out.println(); // Student mistakenly is echoing the input to output to match example 12 System.out.println("x doubled is".02 Develop mode Submit mode Run your program as often as you'd like, before submitting for grading. Below, type any needed Input values in the first box, then click Run program and observe the programs cutout in the second be Enter program input (optional) of your code requires input values, provide them here Ad Cat

Answers

Answer:

The following are the code to this question:

code:

System.out.println(x);  //use print method to print value.

Explanation:

In the given question, it simplifies or deletes code in the 11th line. This line has a large major statement.  

In the case, the tests fail because only 1 line of output is required by the tester, but two lines are obtained instead.

It's to demonstrate that the input/output or testing requirements function throughout the model.

This is C++
Enter wall height (feet):
12
Enter wall width (feet):
15
Wall area: 180 square feet
(2) Extend to also calculate and output the amount of paint in gallons needed to paint the wall. Assume a gallon of paint covers 350 square feet. Store this value using a const double variable. (2 pts)
Enter wall height (feet):
12
Enter wall width (feet):
15
Wall area: 180 square feet
Paint needed: 0.514286 gallons
(3) Extend to also calculate and output the number of 1 gallon cans needed to paint the wall. Hint: Use a math function to round up to the nearest gallon. (2 pts)
Enter wall height (feet):
12
Enter wall width (feet):
15
Wall area: 180 square feet
Paint needed: 0.514286 gallons
Cans needed: 1 can(s)

Answers

Answer:

#include <cmath>

#include<iostream>

using namespace std;

int main()

{

double height, width;

cout<<"Enter wall height (feet): ";

cin>>height;

cout<<"Enter wall width (feet):  ";

cin>>width;

//1

double area;

area = width * height;

cout<<"Wall area: "<<area<<" square feet"<<"\n";

//2

const double gallon = area/350.0;

cout<<"Paint needed: "<<gallon<<" gallons"<<"\n";

//3

cout << "Cans needed :" << round(gallon) << " can(s)";  

return 0;

}

Explanation:

This line declares the height and width as double

double height, width;

This line prompts user for height

cout<<"Enter wall height (feet): ";

This line gets user input for height

cin>>height;

This line prompts user for width

cout<<"Enter wall width (feet):  ";

This line gets user input for width

cin>>width;

//1  Question 1 begins here

This line declares area as double

double area;

The line calculates area

area = width * height;

The line prints the calculated area

cout<<"Wall area: "<<area<<" square feet"<<"\n";

//2  Question 2 begins here

This line declares and calculates gallon as a constant double variable

const double gallon = area/350.0;

This line prints the calculated gallon

cout<<"Paint needed: "<<gallon<<" gallons"<<"\n";

//3  Question 3 begins here

This line rounds gallon to nearest whole number and prints the result

cout << "Cans needed :" << round(gallon) << " can(s)";  

Referencing Microsoft Word:1. How can you save a document created using Word 2016 in a PDF format? Explain the process step by step.2. Assuming you are on the home tab, explain which tabs and buttons you would need to select to open a new blank document?3. Assuming you are on the home tab, explain which tabs and buttons you would need to select to add the "Quick Print" icon to the Quick Access Toolbar.4. Assuming you are on the home tab, explain which tabs and buttons you would need to select to add a bibliography to the document.5. Assuming you are on the home tab, explain which tabs and buttons you would need to select to put a picture within your document?6. Assuming you are on the home tab, explain which tabs and buttons you would need to select to change the page orientation to Landscape?7. What is the purpose of the "ribbon"?8. The Help button from previous versions of Office has been replaced by what words and what symbol?

Answers

Answer:

Referencing Microsoft Word:

1. How can you save a document created using Word 2016 in a PDF format? Explain the process step by step.

Step 1: Click on File Tab

Step 2: Click on Save As Button

Step 3: Select File Location for the document

Step 4: Name the document

Step 5: Save type: Select pdf

Step 6: Save

2. Assuming you are on the home tab, explain which tabs and buttons you would need to select to open a new blank document?

Step 1: Click on File Tab

Step 2: Click on New Button

Step 3: Select or Click Blank Document

3. Assuming you are on the home tab, explain which tabs and buttons you would need to select to add the "Quick Print" icon to the Quick Access Toolbar.

Step 1: Click on File Tab

Step 2: Select Options Button

Step 3: Select Quick Access Toolbar

Step 4: Select Quick Print

Step 5: Click on Add

4. Assuming you are on the home tab, explain which tabs and buttons you would need to select to add a bibliography to the document.

Step 1: References Tab

Step 2: Click Bibliography

Step 3: Insert Bibliography or create as required.  

5. Assuming you are on the home tab, explain which tabs and buttons you would need to select to put a picture within your document?

Step 1: Click on File Tab

Step 2: Click the Open Button

Step 3: Click on Library

Step 4: Select Picture Location

Step 5: Select Picture

Step 6: Click Add

6. Assuming you are on the home tab, explain which tabs and buttons you would need to select to change the page orientation to Landscape?

Step 1: Click Layout Tab

Step 2: Select Orientation

Step 3: Click Landscape

7. What is the purpose of the "ribbon"?

The "ribbon" contains the 8 tabs on the Quick Access Toolbox: File, Home, Insert, Page Layout, References, Mailings, Review, and View.  The "ribbon" groups these specific command categories called tabs.

8. The Help button from previous versions of Office has been replaced by what words and what symbol?

It has been replaced with the lightbulb symbol with these words: “Tell me what you want to do…”  And you can also type Alt + Q to get the same help assistance.

Explanation:

The ribbon is a user interface element created by Microsoft and includes the roll of tabs and buttons.  The Ribbon tabs and buttons bring your favorite commands into the open by showing multiple commands grouped in specific categories.

There are eight tabs along on the ribbon: File, Home, Insert, Page Layout, References, Mailings, Review, and View. Each tab relates to different activities that you can carry out when creating a document.  For example, if you want to save a new document, you click on the File tab which takes you to the Save As button where you choose the file location and save as required.

Prompt the user to input an integer, a double, a character, and a string, storing each into separate variables. Then, output those four values on a single line separated by a space.Enter integer:99Enter double:3.77Enter character:zEnter string:Howdy99 3.77 z Howdyimport java.util.Scanner;public class BasicInput {public static void main(String[] args) {Scanner scnr = new Scanner(System.in);int userInt;double userDouble;// FIXME Define char and string variables similarlySystem.out.println("Enter integer:");userInt = scnr.nextInt();// FIXME (1): Finish reading other items into variables, then output the four values on a single line separated by a space

Answers

Answer:

import java.util.Scanner;

public class BasicInput {

   public static void main(String[] args) {

       //Create an object of the Scanner class

       Scanner scnr = new Scanner(System.in);

       

       //Define int and double variables

       int userInt;

       double userDouble;

       

       //Define char and string variables similarly

       char userChar;

       String userString;

       

       //Prompt the user to enter an integer

      System.out.println("Enter integer:");

       //Store the input in the integer variable

       userInt = scnr.nextInt();

       

       //Prompt the user to enter a double

        System.out.println("Enter double:");

       //Store the input in the double variable

      userDouble = scnr.nextDouble();

       

       //Prompt the user to enter a char

        System.out.println("Enter char:");

       //Store the input in the char variable

      userChar = scnr.next().charAt(0);

       

       //Prompt the user to enter a string

        System.out.println("Enter String:");

       //Store the input in the string variable

      userString = scnr.next();

       

       //Output the four values on a single line

       //separated by a space

       System.out.println(userInt + " " + userDouble + " " + userChar + " " + userString);

       

   }

   

}

Sample Output:

Enter integer:

>>12

Enter double:

>>23

Enter char:

>>s

Enter String:

>>asdasd

12 23.0 s asdasd

Explanation:

The code above has been written in Java. It contains comments explaining every part of the code. Please go through the comments.

Overlay analysis is ____________, taking in data from two or more layers to create a single output layer.

Answers

Explanation:

Overlay analysis is an approach, taking in data from two or more layers to create a single output layer.

For example, if we have a layer of land use and a layer of soil fertility, we can derive from the two layers the percentage of agricultural land developed over fertile soil.

Describe the functions of ALU, resisters, CU, BIU, Cache and FPU.

Answers

Answer:

ALU :An arithmetic logic unit (ALU) is a digital circuit used to perform calculations and logic operations

Registers:register holds the address of memory where CPU wants to read or write data.

CU:The control unit (CU) is a component of a computer's central processing unit (CPU) that directs the operation of the processor.

BIU:BIU takes care of all data and addresses transfers on the buses for the EU like sending addresses, fetching instructions from the memory, reading data from the ports and the memory as well as writing data to the ports and the memory.

Cache:Cache is used to temporarily hold instructions and data that the CPU is likely to reuse.

FPU:A floating-point unit (FPU, colloquially a math coprocessor) is a part of a computer system specially designed to carry out operations on floating-point numbers.

Explanation:

This is all I can say

Which of the following is considered data?A. Quantity sold.B. Best customer by month.C. Best selling item by month.D. Worst selling item by month.

Answers

Answer:

A

Explanation:

A.

What are three purposes of the Media Creation Tool application?

Answers

Answer:

The first purpose fo the Media Creation Tool Application is:

to enable the creation or building the Windows 10 installation media. The Windows 10 installation media is not Windows 10It can also be used to repair an existing installationIt is used to make a bootable USB memory stick for use in the installation of Windows 10

Cheers!

The three purposes of the Media Creation Tool application are:

To stored data.To download a Windows 10 install file.To reinstall Windows 10.

What is the purpose of the media creation tool?

The Media Creation Tool is known to be an application that helps a person to be able to download a Windows 10 install file.

Here the person can get this file and put it into a flash drive or a DVD and then one can save it  so that one can be able to still use it to reinstall the Windows 10. It is known to act as a kind of backup option in case your system has malfunctions.

Learn more about Media Creation from

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Which of the following is typically used in a flowchart to indicate a decision?
a. square
b. rectangle
c. diamond
d. oval

Answers

Diamond is typically used in a flowchart or indicate a decision.

Decisions in flowcharts are indicated by diamonds.

What are flowcharts?

It is a pictorial or symbolic representation of the processes involved in achieving an aim.

In flowcharts, the following apply:

Ovals represent the beginning or end of a processRectangles represent key steps in the processArrows are used to indicate the flow or direction of the processDiamonds represent decision-making. When one of the available options has to be taken.

More on flowcharts can be found here: https://brainly.com/question/14598590

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If (x) = 2x2 + 3, then which of the following represent (-1)? The sum of two even consecutive integers is 114. What is the smallest integer? The initiative, referendum, and the recall comprise a series of Progressive reforms generally known as What is the pattern as the exponents decrease helppppp!!!!!!!!!brainstorm ideas about a whelping dog**give many ideas** You have been accepted into the program that you researched in Task 3. On your first day, a student named Antoine is excited to meet you and takes time to introduce himself. Fill in the missing blanks to respond appropriately to Antoine's questions using the information you learned throughout the unit. Record the conversation using your computer's audio recorder. Attach the file when you submit the unit activity for grading. French Antoine: Bonjour. Toi: Antoine: a va? Toi: Antoine: Comment tu tappelles? Toi: Antoine: Quel ge as-tu? Toi: Antoine: Do viens-tu? Toi: Businesses, individuals, and governments often need to raise capital, while others have surplus funds. In a well-functioning economy, capital flows efficiently from those with surplus capital to those who need it. Transfers can take place in 3 ways: -Select- transfers without going through any type of financial institution, -Select- transfers through investment banks that underwrite the securities, and indirect transfers through financial -Select- that create new forms of capital. how does development occur On a webpage, a _____ provides supplemental material such as social networking feeds and ads. Group of answer choices footer sidebar header navigation bar Which statement best illustrates using the vertical line test to determine if the graph below is a function of x?The graph is not a function of x because the line x = 0 intersects the graph at two points.The graph is a function of x because the line x = 5 does not intersect the graph.The graph is not a function of x because the line y = 0 intersects the graph at two points.The graph is a function of x because the line y = 5 does not intersect the graph. 1. What does the horizontal axis ordinarily measure on an oscilloscope?2. What frequency should the function generator be set to if period of 25 us is a desired?3. If a resistor has the color combination of yellow-violet-red-gold, what is the range of acceptable values of resistance? 4. Given that the voltage from a wall outlet is AC, if you digital multimeter to measure the wall outlet voltage to be 120 V, what is the maximum voltage level provided by the wall outlet Write these prompts in Spanish word form. 1. Monday, 27th of March 2. Friday, 13th of October 3. Sunday, 25th of December 4. Wednesday, 14th of January 5. Friday, 18th of November Giving 14 points total!! still timed! (will flag off-topic answers and remove them, please be serious) Example: Day of the week: sbado Date: el 25 de mayo Clearer example down below attached The Stokes-Oseen formula for drag force F on a sphere of diameter D in a fluid stream of low velocity V, density p and viscosity is F=3DV+9/16pV2d2Is this formula dimensionally homogenous? ______________is a circular chart used to show relationships between colors. a Apex Reel b Standard Deviation c The Color wheel d Hue flow chart e None of these 2(c + 3) = c - 13Solve The point (1/3,1/4) lies on the terminal said of an angle. Find the exact value of the six trig functions and explain which functions are reciprocal functions to each other The _______ two objects are to each other, the stronger the force of gravity is between them. NEED AN ANSWER FAST What did the South gain from the Compromise of 1850?-Slavery would be legal in Washington, DC.-Congress would pass the Fugitive Slave Act.-California would enter the union as a slave state.-Popular sovereignty would decide the slavery issue in Missouri. It was 12C one person got home from school. The weather for port show me a story moving in the world drop the temperature by 70 Celsius. What is the expected temperature? how did the development of agriculture affect native tribes?