The annual decay rate of the radioactive substance is approximately 0.0470%.
To calculate the annual decay rate of a radioactive substance with a half-life of 1475 years, we can use the formula:
decay rate = (ln(2)) / half-life
First, let's calculate ln(2):
ln(2) ≈ 0.693147
Now, we can substitute the values into the formula:
decay rate = (0.693147) / 1475
Calculating this expression, we find:
decay rate ≈ 0.00046997
To express this decay rate as a percentage, we multiply by 100:
decay rate ≈ 0.046997%
Rounding to four significant digits, the annual decay rate of the radioactive substance is approximately 0.0470%.
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Solve by completing the square.
x2 - 4x – 20 = 0
A. x = {-2±6√2}
B. x = {2+6√2}
C. x = {2+2√6}
D. x = {-2±2√6}
Show your work.
Step-by-step explanation:
Subtract
20
from both sides of the equation.
x
2
−
4
x
=
−
20
To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of
b
.
(
b
2
)
2
=
(
−
2
)
2
Add the term to each side of the equation.
x
2
−
4
x
+
(
−
2
)
2
=
−
20
+
(
−
2
)
2
Simplify the equation.
Tap for more steps...
x
2
−
4
x
+
4
=
−
16
Factor the perfect trinomial square into
(
x
−
2
)
2
.
(
x
−
2
)
2
=
−
16
Solve the equation for
x
.
Tap for more steps...
x
=
2
±
4
i
help asap please i need to get thru this
Answer:
The Scale Factor is 1/4.
Step-by-step explanation:
if you multiply each side (of figure A) by 1/4, the product matches with figure B's corresponding sides. for example, 56 to 14, 28 to 7, and 64 to 16.
the scale factor is just how much a chosen shape is multiplied by to get the next shape.
to get bigger shapes into a smaller shape, multiply the sides by fractions like we did this problem.
Does anyone know this one?
Answer:
-3
Step-by-step explanation:
(-5) - (-2) = (-3)
hope it helps
Answer:
there is a three degree difference between san Diego and Los Angeles
Find the value of $x$ .
A circle with center Q has four points L, M, N, and P lie on the circle. Diameter L N and chord M P intersect perpendicularly. The diameter divides the chord M P into two parts with measures 5 x minus 6 and 2 x plus 9.
Answer:
What
Step-by-step explanation:
I dont understand what you are asking
Find a curve that passes through the point (1,5) and has an arc length on the interval [2,6] given by:
6
S2 V1 + 16x dx.
6∫[2,6] (1 + (f'(x))²) dx + 16∫[2,6] x dx = 6S²V1 + 16x dx. To solve this equation, we need additional information about the curve, such as a boundary condition or another equation that relates f(x) and f'(x).
To find a curve that passes through the point (1, 5) and has an arc length on the interval [2, 6] defined by the expression 6S²V1 + 16x dx, we can follow these steps:
Step 1: Determine the general form of the curve equation.
Step 2: Use the arc length formula to obtain an equation involving the curve's equation.
Step 3: Solve the resulting equation to find the specific curve.
Let's proceed with each step:
Step 1: Determine the general form of the curve equation.
Let's assume the curve equation is y = f(x), where f(x) represents the unknown function describing the curve.
Step 2: Use the arc length formula to obtain an equation involving the curve's equation.
The arc length formula for a curve defined by y = f(x) is given by:
S = ∫[a,b] √(1 + (f'(x))²) dx
We are given that the arc length on the interval [2, 6] is defined by the expression 6S²V1 + 16x dx. Substituting the formula for arc length, we have:
6∫[2,6] (√(1 + (f'(x))²))²dx + 16∫[2,6] x dx
Simplifying, we get:
6∫[2,6] (1 + (f'(x))²) dx + 16∫[2,6] x dx
Step 3: Solve the resulting equation to find the specific curve.
Since the expression 6S²V1 + 16x dx represents the arc length on the interval [2, 6], we need to equate it to the arc length formula obtained in Step 2.
6∫[2,6] (1 + (f'(x))²) dx + 16∫[2,6] x dx = 6S²V1 + 16x dx
To solve this equation, we need additional information about the curve, such as a boundary condition or another equation that relates f(x) and f'(x). Without such information, it is not possible to determine the specific curve. Please provide additional constraints or information if available to proceed further in finding the specific curve.
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John flew a kite. He started flying the cat at 2:20 p.m. and ended at 3:14 p.m. How many minutes did John fly a kite?
A. 47 minutes
B. 50 minutes
C. 54 minutes
D. 55 minutes
Answer:
54 minutes
Step-by-step explanation:
3:14 = 3 × 60 = 180 + 14
= 194
2:20 = 2 × 60 = 120 + 20
= 140
194 - 140
= 54
Use the method of undetermined coefficients to solve the initial value problem below. y'' + 7y=7 sin (√7t), y(0) = 8, y'(0)=√7 19 2 y =
The general solution to the initial value problem is:
y(t) = y_c(t) + y_p(t)
= 8 cos(√7t) + cos(√7t)
To solve the initial value problem using the method of undetermined coefficients, we assume a particular solution of the form:
y_p(t) = A sin(√7t) + B cos(√7t)
where A and B are constants to be determined.
Taking the first and second derivatives of y_p(t), we have:
y'_p(t) = A√7 cos(√7t) - B√7 sin(√7t)
y''_p(t) = -A(√7)^2 sin(√7t) - B(√7)^2 cos(√7t)
Substituting these derivatives back into the differential equation, we get:
(-A(√7)^2 sin(√7t) - B(√7)^2 cos(√7t)) + 7(A sin(√7t) + B cos(√7t)) = 7 sin(√7t)
Simplifying, we have:
(-A(√7)^2 + 7A) sin(√7t) + (-B(√7)^2 + 7B) cos(√7t) = 7 sin(√7t)
To satisfy this equation for all t, the coefficients of sin(√7t) and cos(√7t) must be equal to the corresponding coefficients on the right side.
Therefore, we have the following system of equations:
-A(√7)^2 + 7A = 0 (coefficient of sin(√7t))
-B(√7)^2 + 7B = 7 (coefficient of cos(√7t))
Solving these equations, we find:
A = 0
B = 1
So, the particular solution is:
y_p(t) = cos(√7t)
To find the general solution, we need to find the complementary solution by solving the homogeneous equation:
y'' + 7y = 0
The characteristic equation is:
r^2 + 7 = 0
Solving this quadratic equation, we find two complex roots:
r₁ = √7i
r₂ = -√7i
The complementary solution is then:
y_c(t) = C₁ cos(√7t) + C₂ sin(√7t)
where C₁ and C₂ are constants to be determined.
Using the initial conditions y(0) = 8 and y'(0) = √7, we can substitute these values into the general solution and solve for C₁ and C₂.
y(0) = C₁ cos(0) + C₂ sin(0) = C₁ = 8
y'(0) = -C₁√7 sin(0) + C₂√7 cos(0) = C₂√7 = √7
Therefore, C₁ = 8 and C₂ = 1.
The general solution to the initial value problem is:
y(t) = y_c(t) + y_p(t)
= 8 cos(√7t) + cos(√7t)
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Just need the answer thank you
Answer:
The multiplicative rate of change is 3/4
Step-by-step explanation:
Here, we want to get the multiplicative rate of change
In this case, by dividing the succeeding term by the preceding term, we will get the multiplicative rate of change
mathematically, we have this as;
81/128 divided 27/32
= 81/128 * 32/27
= 3/4
Fill in the blank. -6_-1*
>
<
=
Answer:
<
Step-by-step explanation:
-6 is lower than -1. you can make a little line and count backwards from 0. -1 is closer to 0 than -6 is, therefore -1 being bigger and the sign being <
You have two unknown integers. Double the larger integer increased by triple the smaller integer is 46. Squaring the larger number and increasing it by four times itself gives the same result as multiplying the smaller number by 20 and adding 5. Use a system to solve for the integers by graphing
The two unknown integers can be found by graphing the given equations. The larger integer is 10, and the smaller integer is 8.
Let's represent the larger integer as 'x' and the smaller integer as 'y.' According to the given information, we have two equations:
Equation 1: 2x + 3y = 46
Equation 2: x^2 + 4x = 20y + 5
To solve this system of equations, we can graph both equations on the same coordinate plane. The point where the two graphs intersect will give us the values of 'x' and 'y' that satisfy both equations simultaneously.
For equation 1, we rearrange it to y = (46 - 2x)/3. Plotting this equation on the graph, we see a straight line.
For equation 2, we rearrange it to x^2 + 4x - 20y - 5 = 0. Plotting this equation, we get a quadratic curve.
By examining the graph, we can see that the two lines intersect at a point where 'x' is approximately 10 and 'y' is approximately 8. Therefore, the larger integer is 10, and the smaller integer is 8.
By substituting these values back into the original equations, we can verify that they satisfy both equations.
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#1 someone help me with this question pls ??
Answer:
58-51
why to have the speed of a cucumber you need a potato on a skateboard at 1000kmh, ok?
Answer: 4 I think
on each side it has 4
The number of claims follows a negative binomial distribution with parameters β and r, where β is unknown and r is known. You wish to estimate β based on n observations, where xˉ is the mean of those observations. Determine the maximum likelihood estimate of β.
(a) xˉ/r2
(b) xˉ/r
(c) xˉ
(d) rxˉ
(e) r2xˉ
Since s = Σ(xi - x) / n is the sample variance therefore,
Option (a) x/r is correct.
To find the maximum likelihood estimate of β,
We need to maximize the likelihood function L(β) with respect to β.
The likelihood function for a negative binomial distribution with parameters β and r, given n observations with mean x, is,
⇒ L(β) = (Γ(r+n)/Γ(r)n!) (β^r / (β+x)^r+n) ∏([tex]x_i[/tex]+x)/(([tex]x_i[/tex]+β)^r+1
where Γ is the function and ∏ denotes the product over all n observations xi.
Taking the natural logarithm of the likelihood function, we get,
⇒ ln L(β) = ln(Γ(r+n)) - ln(Γ(r)) - ln(n!) + r ln(β) - (r+n) ln(β+x) + Σ ln(xi+x) - Σ ln(xi+β) - (r+1)Σ ln(xi+x)
To find the maximum likelihood estimate of β,
we take the derivative of ln L(β) with respect to β,
set it equal to zero, and solve for β,
⇒ d/dβ ln L(β) = r/β - (r+n)/(β+x) + Σ 1/(xi+β) - (r+1)Σ 1/(xi+x) = 0
We can solve this equation numerically using iterative methods, but we can also simplify it by using the fact that when the derivative of a function equals zero, the function is at a maximum or minimum.
Multiplying both sides of the equation by β(β+x), we get.
⇒ r(β+x) - (r+n)β + β(β+x)Σ 1/(xi+β) - (β+x)(r+1)Σ 1/(xi+x) = 0
Simplifying and solving for β, we get,
⇒ β = x(r+n-1) / (Σ 1/(xi+β) - (r+1)Σ 1/(xi+x))
We can use an iterative method to solve for β, starting with an initial estimate of β and updating it until convergence.
One common method is to use the Newton-Raphson algorithm.
After some algebraic manipulations,
we can show that the maximum likelihood estimate of β is,
⇒ B = x(r / s - 1)
Here s = Σ( - x) / n is the sample variance of the n observations. Therefore, the correct option is (a) x/r.
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Please awnser correctly! I will mark you as Brainliest!
_______1. What is 22% of 10?
_______2. 16% of 30 is ______.
_______3. 25 percent of 50 is ______.
_______4. What is 65% of 300
_______5. Find 10% of 450
A. 195
B. 45
C. 4.8
D. 12.5
E. 2.2
Pa sagot po pls
Answer:
1. 22% of 10 = 2.2
2. 16% of 30 = 4.8
3. 25% of 50 is 12.5
4. 65% of 300 = 195
5. 10% of 450 = 45
HAHA, I KNEW IT!!!
HOPE THIS HELPS!!!!
MARK AS BRAINLIEST (probably)
GIVE 5 STARS PLEASE
Answer:
E - 2.2C - 4.8D - 12.5A - 195B - 45Step-by-step explanation:
For each questions, multiply the whole number by the percentage.
Or, change each percentage by getting rid of the percentage sign and dividing by 100.
EX : 65% = .65 or 22% = .22
10 x .22 = 2.2
QUICK! WHOEVER GIVES CORRECT ANSWER GETS BRAINLIEST
CAN SOMEONE HELP AND EXPLAIN WHAT TO DO PLEASEEEEEEEEEEEEEE
Answer:
a. 19 Questions
b. No, Collins grade was 81%, or B-minus :(
Step-by-step explanation:
There are 21 questions in total on the test. Collin wants a 90 percent at least. If you multiply 21 by 90 percent (as below), you will get 18.9
[tex]21 * .9\\=18.9[/tex]
Of course, you can't get 18.9 questions right (unless you're teacher gives .9 extra points lol, So we need to round UP to a whole number (don't round down because it'll give you a number lower than what 90 percent would equate to.
And, Collin got 17 questions right. That's equivalent to 81 percent of 21 (as below).
[tex]17 / 21\\=.8095[/tex]
This rounds to about 81%, meaning Collin did not reach his goal :(. Oh well, he'll just have to try harder next time!
Have a nice day, fam.
3333 divided by 77. i really need help
Answer:
43.2857142857
plz mark me as brainliest
Answer:
476.142857143
Step-by-step explanation:
Here is a graph of a quadratic function f(x). What is the minimum value (y-value only) of f(x)?
Answer:
Zero.
Step-by-step explanation:
The minimum value is where the function touches the x axis , at y = 0.
How do I find degrees of monomials?
There are 244 seventh grade students. The number of students enrolled in P.E. Is 8 fewer than three times the number of students enrolled in health
Answer:
No. of students enrolled in Health = 63
No. of students enrolled in P.E. = 181
Step-by-step explanation:
Given,
Total students in grade seven = 244 students
A.T.Q.
Let the number of students enrolled in Health be x
so, The number of students enrolled in P.E. = 3x - 8
As we know,
x + (3x - 8) = 244
4x = 244 + 8
x = 252/4
x = 63
Thus, the number of students enrolled in Health = 63
The number of students enrolled in P.E. = 3x - 8
= 3 * 63 - 8
= 189 - 8
= 181 students
A coach ordered 20 practice jerseys for her soccer team. Six of the jerseys she ordered arrived late. What decimal represents the fraction of jerseys that arrived late?
Answer: 0.3
Step-by-step explanation:
There are 20 practice jerseys in total.
Six of those 20 jerseys arrived late.
The fraction of jerseys that arrived late is therefore:
= 6 / 20 jerseys
Convert them to decimal form by dividing the numerator with the denominator:
= 6 ÷ 20
= 0.3
Here's a easy one
Not accepting links!
A biweekly compounding will generate a higher annual percentage yield ( APY )
than a monthly compounding .
True
False
True. A biweekly compounding will generate a higher annual percentage yield (APY) than a monthly compounding.
True. A biweekly compounding frequency will generate a higher annual percentage yield (APY) compared to a monthly compounding frequency. The APY takes into account the effect of compounding on the total return of an investment over a year.
Biweekly compounding means that interest is calculated and added to the account balance every two weeks, resulting in more frequent compounding periods throughout the year. This more frequent compounding leads to the accumulation of interest on a larger balance, thus generating a higher APY.
On the other hand, monthly compounding occurs once a month, resulting in fewer compounding periods and a lower overall APY. Therefore, for the same nominal interest rate, a biweekly compounding schedule will yield a higher APY compared to a monthly compounding schedule.
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A study was run to determine if more than 30% of Cal State East Bay students work full-time. A random sample of 100 Cal State East Bay students had 36 work full-time. The p-value was found to be 0.0952. Group of answer choices There is a 9.52% chance that a random sample of 100 Cal State East Bay students would have more than our sample's 36 working full-time. There is a 9.52% chance that a random sample of 100 Cal State East Bay students would have more than our sample's 36 working full-time if exactly 30% of Cal State East Bay students work full-time. There is a 9.52% chance that a random sample of 100 Cal State East Bay students would have the same as our sample's 36 working full-time if exactly 30% of Cal State East Bay students work full-time. There is a 9.52% chance that a random sample of 100 Cal State East Bay students would have more than 30% working full-time.
The correct option id D. There is a 9.52% chance that a random sample of 100 Cal State East Bay students would have more than our sample's 36 working full-time
A study was conducted to determine if more than 30% of Cal State East Bay students work full-time.
The sample of Cal State East Bay students selected was random.
Out of 100 students, 36 were found to be working full-time.
The p-value was calculated to be 0.0952.
The probability of having more than 36 Cal State East Bay students working full-time out of a random sample of 100 students is 9.52% if exactly 30% of Cal State East Bay students work full-time.
Therefore, it is concluded that the null hypothesis cannot be rejected.
The p-value is greater than 0.05 which shows the significance level.
Hence, we accept the null hypothesis.
The null hypothesis states that the proportion of Cal State East Bay students who work full-time is not greater than 30%.
The alternate hypothesis states that the proportion of Cal State East Bay students who work full-time is greater than 30%.
The test is a right-tailed test.
The sample proportion is p = 0.36. The test statistic is given as Z = (p - P0) / √ [P0 (1 - P0) / n]Z = (0.36 - 0.30) / √ [(0.30) (0.70) / 100] = 1.76The p-value is given as 0.0392.
Since the p-value is less than 0.05, we can reject the null hypothesis.
Thus, we can conclude that more than 30% of Cal State East Bay students work full-time.
Hence, option D is the correct answer.
There is a 9.52% chance that a random sample of 100 Cal State East Bay students would have more than 30% working full-time.
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Hila found the data at the left that shows the number of ways that each sum can be obtained when rolling three dice. a) Determine the mean and the standard deviation. b) Draw a frequency polygon to show the data. c) Does the data have a normal distribution? Explain. Rolling 3 Dice Sum Frequency 3 1 4 3 5 0 6 6 10 7 15 8 21 9 25 10 27 11 27 12 25 13 21 14 15 15 10 16 6 17 3 18 1
a) The mean and standard deviation need to be determined for the given data on the number of ways each sum can be obtained when rolling three dice.
b) A frequency polygon can be drawn to represent the data.
c) Whether the data has a normal distribution or not needs to be determined, and an explanation is required.
a) Mean and Standard Deviation: The mean can be calculated by summing up the products of each value and its corresponding frequency, then dividing by the total frequency. The standard deviation can be calculated by finding the square root of the variance, where the variance is the sum of the squared differences between each value and the mean, divided by the total frequency.
b) Frequency Polygon: A frequency polygon can be plotted by taking the sum values on the x-axis and the corresponding frequencies on the y-axis. Points are plotted for each sum value, and then lines are drawn to connect these points to form the polygon.
c) Normal Distribution: To determine if the data follows a normal distribution, one can visually analyze the frequency polygon. If the polygon displays a symmetric, bell-shaped curve, it suggests a normal distribution. However, if the polygon is skewed or does not exhibit a bell shape, the data is unlikely to have a normal distribution.
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Which of the following answers matches “The quotient of 9 and the sum of the quantities 5 and product of 8 and x.”
Answer:
I believe this is the answer 9/(5 + 8x)
me needs a hug and help
Answer: C
Step-by-step explanation:
Find the value of x in the picture below. (round to nearest tenth if needed) THANK YOU FOR HELPING ME:)
Answer:
it does not form a triangle
Step-by-step explanation:
brainliest give me pls pls pls
Answer:
It forms a obtuse triangle
Step-by-step explanation:
Because two sides are the same.
(6/-7)/(3/11)
6/-7 divided by 3/11
Answer:
-22/7
Step-by-step explanation:
To divide fractions, we multiply by the reciprocal:
(6/-7)/(3/11)
(6/-7)(11/3)
66/-21
22/-7
-22/7
Therefore, your simplifed answer is -22/7
Answer:
36/49
Step-by-step explanation:
108/49/3
=108/147
=36/49
Convert 13,000,000,000,000,000,000,000,000 to scientific notation.
Answer:
1.3 times 10 to the 25th power
Step-by-step explanation:
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the
10
. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.
Answer:
☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆
Hi! The answer to your question is 1.3 x [tex]10^{25}[/tex]
Step-by-step explanation:
☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆
☆Brainliest is greatly appreciated!☆
Hope this helps!!
- Brooklynn Deka