if k (x) = 5x - 6, which expression is equivalent to (k + k) (4)​

Answer:

B

Step-by-step explanation:

I put the answer in an atachement

Answer:

B.

Step-by-step explanation:

In the attached file

Answer:

The rate at which the radius is increasing

dr/dt = 1.91 cm/s

Step-by-step explanation:

The circumference C of a circle can be written as;

C = 2πr .....1

Where;

r = radius

The rate at which the circumference of the circle

is increasing can be written as dC/dt;

Differentiating equation 1, we have;

dC/dt = 2π dr/dt

Making dr/dt the subject of formula;

dr/dt = (dC/dt)/2π

Given;

dC/dt = 12cm/s

Substituting the value of dC/dt;

dr/dt = 12/2π

dr/dt = 1.909859317102 = 1.91 cm/s

The rate at which the radius is increasing dr/dt is 1.91 cm/s

Answer: A ≈ 3.25 in squared

Step-by-step explanation:

So we can work backward using the perimeter of a circle formula to find the radius.

Perimeter of a whole circle: C = 2* 3.14 * r

Since we are only given a quarter of the perimeter we need to multiply the 3.57 by 4 to find C.

C = 14.28

Now we can solve for r using algebra.

[tex]14.28 = 2 *3.14*r[/tex]

Multiply 2 and 3.14

[tex]14.28 = 6.28*r[/tex]

Isolate r through division.

[tex]2.2739 =r\\[/tex]

Now that we have the radius of the circle we can plug that into the area of a circle.

Formula: [tex]A = 3.14* r^2[/tex]

Plug in and solve.

[tex]A = 3.14 * 2.2738^2[/tex]

A = 16.2355 in squared

This however is the area of the whole circle it is just looking for a quarter.

So we can divide the area of the whole circle by 4 to find the final answer.

16.2355 / 4 = 3.2471

Now round to the nearest hundreds which is the second number after the decimal.

A ≈ 3.25

Answer:

C. the cylinder because it has approximately 11.6 in.3 less wasted space than the prism.

The company should choose the cylinder because it has approximately 11.6 in.3 less wasted space than the prism.

We have given that,

A sports company wants to package a ball with a 1.5-inch radius in sets of two.

They have two options a cylinder or a square prism.

2 balls are inside of a cylinder and 2 balls are inside of a square prism. The cylinder has a height of 6 inches and a radius of 1.5 inches.

A square prism is basically a cuboid, that has square bases. It has four rectangular faces and two square-shaped ends. In Geometry, we have studied various three-dimensional shapes called solid shapes or solids.

The square prism has base lengths of 3 inches and the prism has a height of 6 inches.

The company wants to use the package that has the least amount of wasted space.

Therefore, The company should choose the cylinder because it has approximately 11.6 in.3 less wasted space than the prism.

To learn more about the cylinder or a square prism visit:

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Answer:

The correct answer will be:

[tex]-\dfrac{62}{23}[/tex]

Step-by-step explanation:

It is given that :

Initial temperature, [tex]T_1 = 0^\circ F[/tex]

Final temperature,

[tex]T_2 = -15\dfrac{1}{2}^\circ F\\\Rightarrow T_2 = -\dfrac{15\times 2+1}{2} ^\circ F\\\Rightarrow T_2 = -\dfrac{31}{2} ^\circ F[/tex]

Time taken :

[tex]5\dfrac{3}{4}\ hrs = \dfrac{5 \times 4+3}{4}\ hrs = \dfrac{23}{4}\ hrs[/tex]

Change in temperature per hour:

[tex]\dfrac{\text{Difference of temperature}}{\text{Total Time Taken}}\\\Rightarrow \dfrac{T_2-T_1}{\text{Total Time Taken}}[/tex]

Putting the values of temperatures and time:

[tex]\dfrac{\dfrac{-31}{2}-0}{\dfrac{23}{4}}\\\Rightarrow \dfrac{\dfrac{-31}{2}}{\dfrac{23}{4}}\\\Rightarrow \dfrac{-31 \times 4}{2 \times 23}} \text{---- Error done by Wen at this step}\\\Rightarrow \dfrac{-31 \times 2}{23}}\\\Rightarrow \dfrac{-62}{23}}[/tex]

The error done by Wen was during calculating the values of fraction.

So, the correct answer is :[tex]\frac{-62}{23}}[/tex] instead of [tex]\frac{-713}{8}[/tex]

Answer:

C. Wen did not take the reciprocal of the divisor

Step-by-step explanation:

Answer:

$204

Step-by-step explanation:

First, you have to find the price without VAT. To calculate it you have to divide the price including VAT by one plus the rate:

Price including VAT= $240

VAT= 14%

240/(1+0.14)= 240/1.14= 210.52

Now, you have to calculate the 15% of 210.52 and subtract that amount from the price:

210.52*0.15=31.57

210.52-31.57=178.95

Then, you have to calculate the 14% VAT by multiplying the price for 1 plus the rate:

178.95*(1+0.14)= 178.95*1.14= 204

According to this, the reduced price of the shoes including VAT is $204.

Answer:

Option 1.

Step-by-step explanation:

y = x + 2

Put x as 1, 2 and 3 to find y.

y = (1) + 2

y = 3

y = (2) + 2

y = 4

y = (3) + 2

y = 5

When x = 1, y = 3.

When x = 2, y = 4.

When x = 3, y =5.

The values that represent the function is the first table.

Answer:

15.87% probability that 48 or more from this sample were insured by the FHA

Step-by-step explanation:

I am going to use the normal approximation to the binomial to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

[tex]E(X) = np[/tex]

The standard deviation of the binomial distribution is:

[tex]\sqrt{V(X)} = \sqrt{np(1-p)}[/tex]

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that [tex]\mu = E(X)[/tex], [tex]\sigma = \sqrt{V(X)}[/tex].

In this problem, we have that:

[tex]p = 0.28, n = 150[/tex]

So

[tex]\mu = E(X) = np = 150*0.28 = 42[/tex]

[tex]\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{150*0.28*0.72} = 5.5[/tex]

What is the probability that 48 or more from this sample were insured by the FHA?

Using continuity correction, this is [tex]P(X \geq 48 - 0.5) = P(X \geq 47.5)[/tex], which is 1 subtracted by the pvalue of Z when X = 47.5. So

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{47.5 - 42}{5.5}[/tex]

[tex]Z = 1[/tex]

[tex]Z = 1[/tex] has a pvalue of 0.8413.

1 - 0.8413 = 0.1587

15.87% probability that 48 or more from this sample were insured by the FHA

Answer:

she will purchase 8 pounds of potatoes.

But if she had on $3.0

She will purchase only two pounds

Step-by-step explanation:

first pound of potatoes is worth $1.50, the second pound is worth $1.14, the third pound is worth $1.05, and all subsequent pounds are worth $0.30.

1.5+1.14+1.05+0.30=$ 3.99

6-3.99= 2.01

If the rest cost 0.5

Then there are 4 pounds of 0.5 in 2.01.

So total she will purchase 8 pounds of potatoes.

But if she had on $3.0

She will purchase only two pounds, as it will only purchase1.5+1.14+= 2.64 worth of potatoes.

With $6 Janice can get a total of 10.7 pounds, but with $3  she will be able to afford the first two pounds only

Given Data

Amount at hand = $6

First Pound cost = $1.50

Second Pound cost = $1.14

Third Pound cost = $1.05

Total = 1.5+1.14+1.05 =  3.69

Balance  = 6-3.69 = $2.31

Hence the number of pound we can get with $2.31 for subsequent purchase will be

= 2.31/0.3

= 7.7 pounds

This means that the total number of pounds will be

= 3+7.7

=10.7pounds

subsequent Pound cost = $0.3

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Answer:

Step-by-step explanation:

Proportion of retired people under the age of 65 would return to work on a full-time basis if a suitable job were available = 60/100 = 0.6 = P

Null hypothesis: P ≤ 0.6

Alternative: P > 0.6

First, to calculate the hypothesis test, lets workout the standard deviation

SD =  √[ P x ( 1 - P ) / n ]

where P = 0.6, 1 - P = 0.4, n = 500

SD = √[ (0.6 x 0.4) / 500]

SD = √ (0.24 / 500)

SD = √0.00048

SD = 0.022

To calculate for the test statistic, we have:

z = (p - P) / σ where p = 315/500 = 0.63, P = 0.6, σ = 0.022

z = (0.63 - 0.6) / 0.022

z = 0.03/0.022

z = 1.36

At the 2% level of significance, the p value is less than 98% confidence level, thus we reject the null hypothesis  and conclude that more than 60% would return to work.

Answer:

[tex]\chi^2 =\frac{10-1}{18} 23.04 =11.52[/tex]

The degrees of freedom are:

[tex] df =n-1=10-1=9[/tex]

Now we can calculate the critical value taking in count the alternative hypotheis we have two values:

[tex]\chi^2_{\alpha/2}= 2.70[/tex]

[tex]\chi^2_{1-\alpha/2}= 19.02[/tex]

Since the calculated value is between the two critical values we FAIL to reject the null hypothesis and we can't conclude that the true variance is different from 18

Step-by-step explanation:

Information given

[tex]n=10[/tex] represent the sample size

[tex]\alpha=0.05[/tex] represent the confidence level  

[tex]s^2 =4.8^2= 23.04 [/tex] represent the sample variance obtained

[tex]\sigma^2_0 =18[/tex] represent the value to verify

System of hypothesis

We want to verify if the true variance is different from 18, so the system of hypothesis would be:

Null Hypothesis: [tex]\sigma^2 = 18[/tex]

Alternative hypothesis: [tex]\sigma^2 \neq 18[/tex]

The statistic would be given by:

[tex]\chi^2 =\frac{n-1}{\sigma^2_0} s^2[/tex]

And replacing we got:

[tex]\chi^2 =\frac{10-1}{18} 23.04 =11.52[/tex]

The degrees of freedom are:

[tex] df =n-1=10-1=9[/tex]

Now we can calculate the critical value taking in count the alternative hypotheis we have two values:

[tex]\chi^2_{\alpha/2}= 2.70[/tex]

[tex]\chi^2_{1-\alpha/2}= 19.02[/tex]

Since the calculated value is between the two critical values we FAIL to reject the null hypothesis and we can't conclude that the true variance is different from 18

Answer:

Option C is correct.

Alex earned about $60 more than Joaquin did.

Step-by-step explanation:

The linear regression equation

y = 0.18 x + 320.22

is used to predict the weekly salary, y, of an employee who sells x dollars worth of merchandise.

Joaquin sold $1500 worth of goods. Meaning that x for that week for Joaquin is 1500.

Joaquin' s salary for that week is then given as

y = 0.18x + 320.22

y = 0.18(1500) + 320.22 = 590.22

Hence, Joaquin's salary for that week = $590.22

Alex earns $650 that week. Meaning that y for Alex in that week = 650

y = 0.18x + 320.22

650 = 0.18x + 320.22

0.18x = 650 - 320.22 = 329.78

x = (329.78/0.18) = 1832.1

Hence, Alex sold goods worth $1832.1 that week.

Joaquin sold goods worth $1500

Joaquin earned $590.22

Alex sold goods worth $1832.1

Alex earned $650

From this calculation, it is evident that 'Alex earned about $60 more than Joaquin did' is the correct option as $650 is about $60 more than $590.22

Hope this Helps!!!

Answer:

the answer is C :)

Step-by-step explanation:

Answer:

The number of dimes is 3n - 8

Step-by-step explanation:

Here, we are interested in writing an expression for the number of dimes.

We proceed as follows;

Now, there are n nickels with the number of dimes been 8 less than 3 times the number of nickels

That would be;

3(n) -8 = 3n -8

Answer:

50

Step-by-step explanation:

7850/3.14

Square root 2500

50

Answer:

51.38% probability that they requested regular gas

Step-by-step explanation:

Bayes Theorem:

Two events, A and B.

[tex]P(B|A) = \frac{P(B)*P(A|B)}{P(A)}[/tex]

In which P(B|A) is the probability of B happening when A has happened and P(A|B) is the probability of A happening when B has happened.

In this question, we have that:

Event A: Not filling the tank

Event B: Regular gas

40% of the customers request regular gas

This means that [tex]P(B) = 0.4[/tex]

Of those customers requesting regular gas, 70% only fill up part of their tank.

This means that [tex]P(A|B) = 0.7[/tex]

Probability of not filling the tank:

70% of 40%(regular gas)

100 - 60 = 40% of 35%(unleaded gas).

100 - 50 = 50% of 25%(premium gas).

So

[tex]P(A) = 0.7*0.4 + 0.4*0.35 + 0.5*0.25 = 0.545[/tex]

What is the probability that they requested regular gas?

[tex]P(B|A) = \frac{0.4*0.7}{0.545}[/tex] = 0.5138

51.38% probability that they requested regular gas

Answer:

Step-by-step explanation:

This is a ratio problem. there are 20 Blonde Teachers, and 12 brown haired teachers. The fraction is 12/20. We can simplify this fraction to 3/5. for every 3 brown haired Teacher, there is 5 other blonde hair teachers.

Answer:

67.5

Step-by-step explanation:

right angle =90 degree

total = 360 degree

360-90=270

270÷4=67.5

Answer:

none of the above

Step-by-step explanation:

Take the absolute value of the second point and subtract the first point

| 1/3 -( -4/3)|

Since this answer does not match any of the above choices

Answer:

None of the above.

Step-by-step explanation:

The distance between -4/3 and 1/3 is

|1/3-(-4/3)| =|1/3 + 4/3|

This is not in the option so;

None of the above.

Answer:

(a)p(3,3)=0.0416

(b)p(4,11)=0.0002

Step-by-step explanation:

Number of Customers, X

[tex]\left\begin{array}{|c|ccccc|}X&0&1&2&3&4\\P(X)&0.1&0.2&0.3&0.25&0.15.\end{array}\right[/tex]

Y = the total number of packages to be wrapped for the customers waiting in line

[tex]\left\begin{array}{|c|ccccc|}Y&1&2&3\\P(Y)&0.55&0.35&0.1\end{array}\right|[/tex]

a. P(X = 3, Y = 3)

p(3,3) means that there are 3 customers with one gift each

The probability of this event happening:

[tex]0.25 \times 0.55^3=0.0416[/tex]

p(3,3)=0.0416

b. p(4,11)

For 4 people to have a total package of 11, there must be 3 customers with 3 packages each and 1 customer with 2 packages,

The probability of this happening is:

[tex]p(4,11)=0.15\times^4C_1\times0.1^3\times0.35\\p(4,11)=0.0002[/tex]

Answer:

36

Step-by-step explanation:

Answer:

The answer is 2/9

Step-by-step explanation:

2(2)^0 (3)^-2 = 2(1)/(3)^2 = 2/9

Answer:

B: 3/2x - 7 + 3 = 0

Step-by-step explanation:

Answer: C

Step-by-step explanation:

General form is in Ax+By+C. To do this, you move everything onto one side.

[tex]\frac{3}{2}x -y+3=0[/tex]

This should be the general form, but this is not correct in these answer choices! Let's try this another way to get Ax+By+C by making Ax not a fraction.

[tex]y=\frac{3}{2} x-3[/tex]

[tex]y+3=\frac{3}{2} x[/tex]

[tex]2(y+3)=3x[/tex]

[tex]2y+6=3x[/tex]

[tex]3x-2y-6=0[/tex]

This may seem incorrect, but we can always check our answer by plugging in numbers.

In our slope intercept form, let's say x=2. What would be our y?

[tex]y=\frac{3}{2} (2)-3[/tex]

[tex]y=3-3[/tex]

[tex]y=0[/tex]

Now we know our coordinates should be (2, 0). When we rewrite the slope-intercept form, we should still get 0 when we plug in x=2 and y=0. Let's check on all answer choices to see which one works.

A. Correct

-3(2)+2(0)+6

-6-6=0

0=0

B. Incorrect

3/2(2)-(0)+3

3+3=6

6≠0

C. Correct

3(2)-2(0)-6

6-6=0

0=0

D. Incorrect; not general form

2(0)=3(2)-6

0=6-6

Now, you can see that A and C are both correct, but the main difference, is that you want to make A positive. The only option where A is positive is in answer C.

Answer:

2/3

Step-by-step explanation:

5/12+1/4

Make the fractions have the same denominator.

5/12 + 1×3/4×3

5/12 + 3/12

Add the fractions.

(5+3)/12

8/12

Simplify.

2/3

Answer:

[tex] = \frac{2}{3} \\ [/tex]

Step-by-step explanation:

[tex] \frac{5}{12} + \frac{1}{4} \\ \frac{5 + 1 \times 3}{12} \\ \frac{5 + 3}{12} \\ = \frac{8}{12} \\ = \frac{2}{3} [/tex]

Answer: 30 in^2

Step-by-step explanation:

Answer: choice B

Step-by-step explanation:

Events A and B are independent if the equation P(B)=P(B|A) or P(A∩B) = P(A) · P(B) holds true.

in this example

p(A)=1/6    {5}

p(B)=1/2   {1,3,5}

P(B|A)=1

so

P(B)≠P(B|A)

=>A and B are dependent

Answer:

C:

Step-by-step explanation:

In the attached file

Answer:

1.25

Step-by-step explanation:

Lets sum up the values

24

and then divide by their number (8)

we get 3 on average

now let's see how much each data point varies from that average (this is always a positive value)

1, 1, 2, 1, 1, 1, 3, 0

Let's sum and divide by 8 again

10/8 = 1.25

(would really, reallly appreciate the brainliest)

Answer:

29/5 =x

Step-by-step explanation:

25 = 5x − 4

Add 4 to each side

25+4 = 5x − 4+4

29 = 5x

Divide each side by 5

29/5 = 5x/5

29/5 =x

Answer:

The answer is 6

Step-by-step explanation:

:)

Answer:

The answer is option 2.

Step-by-step explanation:

Given that the formula for length of arc is :

[tex]arc = \frac{θ}{360} \times 2 \times \pi \times r[/tex]

Answer:

B

Step-by-step explanation:

It could also be

[tex] \frac{\pi \times r \times m}{180} [/tex]

Answer:

y = -4x + (any number)

Step-by-step explanation:

you want to use the negative reciprocal of the slope for line f

so m = -4, since you didn't say any points it has to go through then the

equation of the line is y = -4x + (any number)

Answer:

-4× - 4 That is the answer

Answer:

B. h=S/πr²

Step-by-step explanation:

The question lacks options. Here is the complete question.

Which of the following equations is equivalent to S = πr²h

a. h=S-πr^2

b. h=S/πR^2

C. h= πr^2/S

D. h=S+ πr^2

To know the equation equivalent to πr²h, we will make h the subject of the formula as shown from the one given in equation.

S = πr²h

To get h, we will divide both sides by the coefficient of h (i.e πr²)

S/πr² = πr²h/πr²

S/πr² = h

h = S/πr²

This shows that h = S/πr² is equivalent to S = πr²h