5.94 minutes is the half-life, or the amount of time it takes to half the substance to degrade (about 6 minutes).
Define the half-life of a radioactive substance?A radioactive sample's half-life is the amount of time it takes for half of its atomic nuclei to spontaneously transform into another nuclear species and emit particles and energy.When we use the formula A = A0(1 - r)t,
where A is the quantity of a substance we have at any given moment (t), A₀ is the quantity we have at the beginning (at t = 0), and r is the rate of decay, we may state the following:(1/2)A₀ = A₀(1 - 0.11)t
[Divide both sides by A₀ results in:
1/2 = (0.87)t
Using the log of both sides;:
log(1/2) = log(0.87)t
Using a logarithm property, we can bring the "t" to the front, giving us:
log(1/2) = t.log(0.89)
[Dividing both sides with log(0.89) gets us:
t = log(1/2)/log(0.89)
Using calculator for soling the values.
t = 5.94 seconds
Thus, 5.94 minutes is the half-life, or the amount of time it takes to half the substance to degrade (about 6 minutes).
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mary lee's natural food store sells a combination of teas. the most popular is a mixture of a tea that sells for per pound with one that sells for per pound. if she needs of tea that will sell for per pound, how many pounds of each tea should she use?
She may thus combine 21 pounds of tea priced at $3 and 14 pounds of tea priced at $2 to create tea that costs $2.6 per pound.
What is expression?An expression, often known as a mathematical expression, is a finite collection of symbols that are well-formed in accordance with context-dependent principles. Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation. An expression's structure is as follows: (Number/variable, Math Operator, Number/variable) is an expression.
Here,
Let 3x be the pounds of tea for $3 and 2x be the pounds of tea for $2.
Total required pounds=35
3x+2x=35
x=35/5
x=7
So, She can add 21 pounds of tea for $3 and 14 pounds of tea for $2 to make the tea that is $2.6 per pound.
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The following information was collected from a simple random sample of a population. 9 13 15 15 21 24 The point estimate of the population standard deviation is Select one: O a. 59.1. O b. 7.688. O C. 7.018. O d. 49.25.
The point estimate of the population standard deviation is Select one is 5.4558.
Given data
9,13,15,15,21,24
We have to find first mean
Here n=6
[tex]$\begin{aligned} \text { mean } \bar{x} & =\frac{\sum x_i}{n} \\ & =\frac{9+13+15+15+21+24}{6} \\ & =\frac{97}{6} \\ & =16.166\end{aligned}$[/tex]
[tex]$\therefore$[/tex] Standard deviation
[tex]S=\sqrt{\frac{\sum\left(x_i-x\right)^2}{n-1}}$$[/tex]
S= root (9-16.(66)^2+(13-16.166)^2+(15-16.166)^2+(15-16.166)^2+(21-16.166)^2+(25- 16.166)^2/(6-1)
[tex]\begin{aligned}& =\sqrt{\frac{148.833336}{5}} \\& =\sqrt{29.7666} \\& =5.4558\end{aligned}[/tex]
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Answer:
Step-by-step explanation:
b) 7.688 The point estimate of the population standard deviation is 7.688. The point estimate of a population parameter is the estimate of the population parameter based on a single sample. In this case, the point estimate of the population standard deviation is the sample standard deviation, which is a measure of the spread or variability of the sample data. To calculate the sample standard deviation, we need to first calculate the sample mean, which is the average of the values in the sample. In this case, the sample mean is (9 + 13 + 15 + 15 + 21 + 24)/6 = 14.5. We can then use this value to calculate the sample standard deviation, which is √(((9-14.5)² + (13-14.5)² + (15-14.5)² + (15-14.5)² + (21-14.5)² + (24-14.5)²)/6) = 7.688. This is the point estimate of the population standard deviation. The other answer choices are not the sample standard deviation.
i need help asap !!!!!!
Answer: A and C is incorrect, the middle is 14. The minimum is 13. The max is 16.
Step-by-step explanation: B is correct
there is no 12
If a building i 50 feet in diameter and you need 20 feet of clearance all the way around the building, how many feet of fence to you need to go around the building?
31.41 feet of fence to you need to go around the building.
What is circumference of a circle?
The measurement of the circle's boundaries is called as the circumference or perimeter of the circle. whereas the circumference of a circle determines the space it occupies. The circumference of a circle is its length when it is opened up and drawn as a straight line. Units like cm or unit m are typically used to measure it. The circle's radius is considered while calculating the circumference of the circle using the formula. As a result, in order to calculate the circle's perimeter, we must know the radius or diameter value.
The radius of the circle given is = 50/2 feet.
So the clearance of 20 feet will be there all way.
So total effective radius will be 25-20 5 feet.
the circumference is 2πr = 2*π*5 = 31.41 feet
Hence, 31.41 feet of fence to you need to go around the building.
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let x and y be i.i.d. unif(0, 1). (a) compute the covariance of x y and x −y. (b)arex y andx−y independent?
⇒ Yes X+Y and X-Y are independent
What is covariance?
Covariance is a measure of the combined variability of two random variables used in probability theory and statistics. The covariance is positive if the greater values of one variable primarily match the greater values of the other variable, and the same is true for the lesser values.
Define U=X+Y, V=X−Y
Then, [tex]x=\frac{(U+V)}{2}[/tex], and
[tex]Y=\frac{(U-V)}{2}[/tex]
Find the Jacobian J for the transformation.
Then, fU,V(u,v)= fX(x=(u+v)/2) fY(y=(u−v)/2)|J|
You will find that fU,V(u,v) factors into a function of u alone and a function of v alone. Thus, by the Factorization thm, U and V are independent.
b) Yes X+Y and X-Y are independent
a) Since , X+Y and X-Y are independent,
COV(X+Y , X-Y) = 0 Answer
Cov(X+Y , X-Y) = 0
b)
Yes these are independent
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does someone mind helping me with this question? Thank you!
Answer:
50,000
Step-by-step explanation:
1,750 x 2 = 3,500
25,000 x 2 = 50,000
Solve using substitution.
y = –7x − 8
y = 2x + 10
please
help I will give brainly
The distance AC to be covered for the given triangle will be 429.94 meters.
What is a triangle?A triangle is a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices.
Triangle is a very common figure to deal with our daily life for example in our daily life to measure the height of any tower then there is a huge application of the right angle triangle.
As per the given triangle,
By cosine law,
Cos∠ABC = (220² + 430² - AC²)/(2 × 220 × 430)
Cos∠ABC = (233300 - AC²)/189200
Cos(180° - 75°) = (233300 - AC²)/189200
(233300 - AC²) = -48968.56
AC² = 184331.4367
AC = 429.94 meter
Hence "The distance AC to be covered for the given triangle will be 429.94 meters".
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the regression equation netincome = 2,277 + .0307 revenue was estimated from a sample of 100 leading world companies (variables are in millions of dollars). (a-1) calculate the residual for the x, y pair ($41,078, $8,301).
From a sample of 100 leading world companies we can estimate the residual value is 4,762.9054 .
It is given that,
Regression equation net income = 2277+0.0307
From a sample of 100 leading world companies we can estimate the revenue.
(a-1)
for the (x,y) pair, x = $41,078 and y = $8,301 or it is represented as ($41,078 , $8,301)
then the above (x,y) pair's residual value is e = y - ÿ
ÿ = 2277+0.307x
= 2277+0.0307(41078)
= 2277+1261.0946
= 3538.0946
Thus, e = y - ÿ
so, e = 8301 - 3538.0946
= 4762.9054
Hence, the residual value = 4,762.9054
To calculate the correlations between a dependent variable and one or more independent variables, a statistical technique grouping together several statistical techniques known as regression analysis is utilized. Revenue is the entire amount of money received from the sale of goods or services related to a company's main operations. Revenue, also known as gross sales, is often referred to as the "top line" because it appears at the top of the income statement. The residual value, also known as salvage value, is the estimated value of a fixed asset at the end of its useful life or lease term.
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You and a classmate have been paired to solve an equation. Your partner says they got an answer but the solution they found does not work when they checked it. Here is their work:
6 (8-3x )− 3 (9x−1 )+ 60
54 - 18x = −27x − 3 + 60
54 - 18x = −27x + 57
-18x = -27x + 3
9x = 3
x= 1/3
Explain all of the mistakes your partner made and how to correct them. After correcting the mistakes, write the correct answer for this equation.
The mistake are shown below and the correct steps are shown below.
What is an expression?
Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.
Given that;
The expression is,
⇒ 6 (8 - 3x) = - 3 (9x - 1) + 60
And, All the steps are;
⇒ 6 (8 - 3x ) = - 3 (9x - 1 ) + 60
⇒ 54 - 18x = −27x − 3 + 60
⇒ 54 - 18x = −27x + 57
⇒ -18x = -27x + 3
⇒ 9x = 3
⇒ x= 1/3
Now,
Since, The expression is,
⇒ 6 (8 - 3x) = - 3 (9x - 1) + 60
Cleary, In the second step 2; your partner doing mistake.
So, All the correct steps are;
⇒ 6 (8 - 3x) = - 3 (9x - 1) + 60
⇒ 48 - 18x = - 27x + 3 + 60
⇒ 48 - 18x = - 27x + 63
⇒ 27x - 18x = 63 - 48
⇒ 9x = 15
⇒ x = 15/9
⇒ x = 5/3
Thus, The correct value is;
⇒ x = 5/3
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urgent help needed the question is written in the image below plss
#1= 36
#2=81
#3= 32
#4=125
Is 700% of 6 less than 10,greater than 10 but less than 100,or greater than 100?
Greater than 100. 700% of 6 is 42.
find the dimensions of a right circular cylinder of maximum volume that can be inscribed in a sphere of radius cm. what is the maximum volume?
The dimensions of a right circular cylinder of maximum volume are
[tex]5\sqrt{6}[/tex] and [tex]10\sqrt{3}[/tex].
Given the radius of sphere is 15 cm.
Let's assume radius of right circular cylinder = r
height of right circular cylinder = h.
Since the cylinder is inscribed in the sphere, their centers will coincide. As a result, the height is divided into two equal portions from the sphere's center. Therefore, we can apply Pythagoras' Theorem to get the cylinder's half-height in terms of radius.
[tex]R^2 = r^2 + (h/2)^2.[/tex]
[tex]r^2 = R^2 - h^2/4.[/tex]
Volume of cylinder = [tex]\pi*r^2*h.[/tex]
Now we can substitute value of [tex]r^2[/tex] in volume of cylinder.
V = [tex]\pi*( R^2 - h^2/4)*h[/tex]
taking R = 15 .
V = [tex]\pi*(225 - h^2/4)*h[/tex]
V = [tex]\pi*225*h - \pi*h^3/4[/tex]
For maximum volume we have to do derivative of volume = 0
derivative with respect to h.
V' = [tex]\pi*225 - 3*\pi*h^2/4[/tex]
V' = 0
[tex]\pi*225 - 3*\pi*h^2/4[/tex]= 0
[tex]3*h^2/4 = 225[/tex]
[tex]h^2 = 75*4.[/tex]
h = 10[tex]\sqrt{3}[/tex]
put the value of h in [tex]r^2 = 225 - h^2/4[/tex]
[tex]r^2[/tex] = 225 - (300/4)
[tex]r^2[/tex] = 150
r = [tex]\sqrt{150}[/tex]
r = 5[tex]\sqrt{6}[/tex].
So the dimensions of a right circular cylinder are 10[tex]\sqrt{3}[/tex] and 5[tex]\sqrt{6}[/tex].
Given Question is incomplete, Complete Question here:
find the dimensions of a right circular cylinder of maximum volume that can be inscribed in a sphere of radius 15 cm. what is the maximum volume?
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expected counts 153 94.5 63 49.5 45 45 enter the test statistic - round to 4 decimal places. test statistic
On solving the provided question, we got that - 0.000005178 as the P-value,the null hypothesis is a common statistical theory that contends that no statistical relationship
How do you define a null hypothesis?Using a single observed variable to compare two sets of observed data and measured phenomena, the null hypothesis is a common statistical theory that contends that no statistical relationship and significance exists.
h0; no change in beverage preferences
h1: alterations in drink preferences
alpha = 0.05
We find the test statistics' solution.
The attachment underwent the chsquare test.
Chi-square: (O-E)2/E
Chi square is 32.30188.
[tex]number of degrees of freedom = n-1 = 6-1 = 5[/tex]
I determined the p value using the chi distribution tool in Excel.
CHIDIST(3.20188, 5) =
0.000005178 as the P-value
We reject the null hypothesis since the pvalue is less than 0.05 and come to the conclusion that there is enough evidence to support the shift in drink preferences.
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I need help with a linear equation.
The slope (-8) of the linear equation that is represented by the table, is the amount Austin pays each week, which is $8.
What is the Slope of a Linear Equation?A linear equation which is given as y = mx + b, has a slope value which represents the change in y over a change in x and is given by the value of m in the linear equation.
If a table is said to represent a linear equation, the slope of the linear equation, which can also be called the unit rate, can be found by using two pairs of values from the table to calculate the change in y over the change in x.
Given that the table above represents a linear equation where L is dependent on the value of t, it means that slope of the linear equation represents the amount Austin paid back each week.
Find the slope using two points, (2, 24) and (4, 8):
Slope (m) = (24 - 8) / (2 - 4)
m = 16/-2
m = -8
Therefore, this means that Austin pays $8 every week.
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If a 16-foot utility pole is connected to a cable
that is attached to the ground 12 feet from the
base of the pole, find then length of the cable?
Answer:20 ft
Step-by-step explanation:
Using Pythagoras' Theorem:
[tex]h^{2} = a^{2} +b^{2} \\h^{2} = 16^{2} +12^{2} \\h^{2} = 256+144h^{2} = 400\\\\[/tex]
Now you want to get h alone. To do that you need to get rid of the squared by finding the square root of 400.
[tex]h=\sqrt{400}\\h=20[/tex]
The figure is made up of a cone and a cylinder.
To the nearest whole number, what is the volume of this figure?
Use 3.14 to approximate π . Round only your final answer to the nearest whole number.
Enter your answer in the box.
The volume of the composite shape is 38mm³(nearest whole number)
What is a composite solid?A composite shape can be defines as a shape created with two or more basic shapes. We often refer to composite shapes as compound and complex shapes.
The volume of a the composite solid above = volume of cone + volume of cylinder
volume of cone = 1/3πr²h
=1/3×3.14×2²×3
= 12.56mm³
volume of the cylinder = πr²h
= 3.14×2²×2
= 25.12mm³
therefore the volume of the shape = 12.56+25.12
= 37.68mm³
= 38mm³( nearest whole number)
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a bathtub filled with 55 gallons of water is drained. the water drains at a rate of 5 gallons per minute. the function f(x)=-5x+55 represents the volume of water in the tub as it drains. how many minutes has passed if the tub still has more than 20 gallons of water remaining in it.
f-1(x)=1\5x-11
Step-by-step explanation:
louisa walks from her school 40 feet south and then walks 100 feet east. what is the shortest distsnce louisa is from her school? round to the nearest tenth
The shortest distance Louisa is from her school is 107.7 feet
How to determine the shortest distance from her school?From the question, we have the following parameters that can be used in our computation:
East = 100 feet
South = 40 feet
The shortest distance from her school is calculated using the following theorem
Shortest distance = √(East² + South²)
Substitute the known values
Shortest distance = √(100² + 40²)
Evaluate
Shortest distance = 107.7
Hence, the shortest distance = 107.7 feet
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The money
m
(in £) Noah has to spend each week is his wage
w
(in £) subtract the tax
t
(in £) he pays on his income. Enter a formula for the money he can spend and enter how much he has to spend if he earns £160 a week and pays £55 in tax.
If Noah earns £160 a week and pays £55 in tax, he has £160 - £55 = £160-£55 = £105 to spend.
What is meant by subtraction?Subtraction is a mathematical procedure that includes subtracting one number from another. For example, if we have five apples and subtract three of them, we are left with two apples. Beginning with the bigger number and deducting the smaller number from it is how subtraction is done. Subtraction is denoted by the minus symbol (-). A difference is the outcome of a subtractive operation.
We may better grasp how to solve issues requiring the removal of one or more elements from a set by understanding the fundamental mathematical formula of subtraction. It is employed in many different scenarios, such as when we need to subtract incomes on a regular basis.
How to solve?
The formula for the money Noah has to spend each week is m = w - t.
£160 - £55 = £160 - £55 = £105
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Need help, please!
Is a^+b^6 = (a²+b²)(a^4-a²b^2+b^4) an identity? Explain or show your reasoning.
Expression a⁶ + b⁶ = (a² + b²)(a⁴ - a²b² + b⁴) is an identity, by left-hand term and right-hand term property.
What is an algebraic expression?An algebraic expression is consists of variables, numbers with various mathematical operations,
The given expression is,
a⁶ + b⁶ = (a² + b²)(a⁴ - a²b² + b⁴)
To prove that the given expression is an identity,
Solve left-hand term,
Substitute a² = x, b² = y
a⁶ + b⁶
= x³ + y³
Use formula x³ + y³ = (x + y)(x² - x y + y²)
= (x + y)(x² - x y + y²)
Again substitute x = a², y = b², expression will be,
= (a² + b²)(a⁴ - a²b² + b⁴)
Hence, a⁶ + b⁶ = (a² + b²)(a⁴ - a²b² + b⁴)
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for a list of five positive integers, none greater than 100, the mean is 1.5 times the mode. if 31, 58, 98, $x$ and $x$ are the five integers, what is the value of $x$?
The value of x from the given five integers is 34.
Here we have to find the value of x.
Data given:
Five positive number = 31, 58, 98, x, x
The mean is 1.5 times the mode.
Mean = (31 + 58 + 98 + x + x) / 5
= (187 + 2x) / 5
Mode = x
As the mean is 1.5 times the mode so from this we have:
mean = 1.5 × mode
(187 + 2x)/ 5 = 1.5x
187 + 2x = 7.5x
5.5x = 187
x = 34
Therefore the value of x is 34.
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let n be a positive integer and suppose n distinct lines are drawn in the plane. no two of these lines are parallel, and no three of these lines intersect at a common point. prove that these lines divide the plane into n 0 c n 1 c n 2 regions.
There are 0 lines, 1 regions, and no line junctions. There are always k+1k+1 regions and kk intersections added whenever a line is added and crosses k other lines.
Another perspective is that k+1k+1 areas are added for each line and k intersections added (the number of added lines and intersections).Consequently, the total number of regions is 1 plus the sum of the number of lines and junctions.The number of intersections is 1 + the number of lines. There are (n2) (n2) crossovers with nn lines (if no two lines are parallel and no three lines are coincident). Therefore, there are (n2) +n+1=n(n1)/2+n+1=n2+n+2/2 areas instead of (n2) +n+1=n(n1)/2+n+1=n2+n+2/2).
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20 chairs at four tables equals how many chairs per table
Answer:
5 chairs per table.
Step-by-step explanation:
please help me with my homework Find the value of x in the parallelogram
Adjacent angles of a parallelogram are supplementary.
[tex]x+2x=180 \\ \\ 3x=180 \\ \\ x=\boxed{60}[/tex]
12 is 30% of what number?
Answer: 3.6
Step-by-step explanation:
Step 1: 30/100 = x/12
Step 2: Multiply 12x30 and then divide it by 100
Quickly and fast which expression is equivalent to 4(3/4y - 2 + 1/2y? choose all that apply
a.4y-8
b.5y-8
c.3y-8+2y
d.-3y
e.3y+8+2y
f.5y+8
Answer: 2y4 + 4y2
Step-by-step explanation:
2y3 + 4y2
2y4 + 4y2✔
1/2y3 + 1y2
1/2y4 + 4y2
An environmental group conduct a tudy to meaure energy conumption in a large metropolitan city a meaured by the amount of gaoline purchaed. In a random ample of 17 vehicle owner on a particular day, they calculated a mean of 13. 62 gallon and a tandard deviation of 4. 68 gallon. What i the tandard error of the ample mean?
The random sample study's standard error, which measures the energy usage in a major metropolis, is 0.275.
How is the standard error calculated?The standard deviation among the sample means is typically the standard error of a sampling distribution. It fluctuates inversely with sample size, meaning that as sample size rises, the sampling distribution's standard error falls.The formula used to compute standard error is as follows:
standard error = standard deviation / √sample size
For the data given in question-
In a random sample of 17 car owners on a given day, the mean fuel consumption was 13.62 gallons, and the standard deviation was 4.68 gallons.Thus,
Standard error = 4.68 / 17
Standard error = 0.275
Thus, the standard error for the mean of the sample is found as 0.275.
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PLS HELP!!! I really need help!
Use substitution to solve the system.
5x + 4y = 9
-2x + y = -14
Answer:
x=9/5 − 4y/5
x = 7 + y/2
Step-by-step explanation:
Move all terms that don't contain x to the right side and solve.
9. What is the distance between the coordinates (9, -2) and
(9,8)?
Answer:
10
Step-by-step explanation:
if u got up 10 from (9,-2) you will get to (9,8)