The cost c in £ of a monthly phone contract is made up of the fixed line rental l in £ and the price p in £ of the calls made. Enter a formula for the cost and enter the cost if the line rental is £35 and the price of calls made is £12

I can't see the photo ....

Answer:

15 books

Step-by-step explanation:

Given that Victor read a total of 12 books over 4 months which means for 1 month he reads 12/4 = 3 books

Also given that he belongs to the book club for 5 months

We know that he reads 3 books in 1 month

So in 5 months he reads [tex]5\times3=15books[/tex]

Answer:

   6 < x < 23.206

Step-by-step explanation:

To properly answer this question, we need to make the assumption that angle DAC is non-negative and that angle BCA is acute.

The maximum value of the angle DAC can be shown to occur when points B, C, and D are on a circle centered at A*. When that is the case, the sine of half of angle DAC is equal to 16/22 times the sine of half of angle BAC. That is, ...

  (2x -12)/2 = arcsin(16/22×sin(24°))

  x ≈ 23.206°

Of course, the minimum value of angle DAC is 0°, so the minimum value of x is ...

  2x -12 = 0

  x -6 = 0 . . . . . divide by 2

  x = 6 . . . . . . . add 6

Then the range of values of x will be ...

  6 < x < 23.206

_____

* One way to do this is to make use of the law of cosines:

  22² = AB² + AC² -2·AB·AC·cos(48°)

  16² = AD² + AC² -2·AD·AC·cos(2x-12)

The trick is to maximize x while satisfying the constraints that all of the lengths are positive. This will happen when AB=AC=AD, in which case the equations be come ...

  22² = 2·AB²·(1-cos(48°))

  16² = 2·AB²·(1 -cos(2x-12))

The value of AB drops out of the ratio of these equations, and the result for x is as above.

Answer 6<x<30:

Step-by-step explanation:

Answer:

Translated in numerical form: x - 2 ≤ 33.

The solution graph on a numbered line is shown in figure a.

The solution in a set notation: {x|x ≤ 35}

The solution in interval notation: (-∞, 35]

Step-by-step explanation:

"two less than a number is less than or equal to thirty three".

let's say the number is  x.

Translated in numerical form: x - 2 ≤ 33.

Lets solve it:              

                       x - 2 ≤ 33

                       x  ≤ 33 + 2

                       x  ≤ 35

The solution graph on a numbered line is shown in figure a.

The solution in a set notation: {x|x ≤ 35}

The solution in interval notation: (-∞, 35]

Keywords: inequality, graph

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Answer:

128

Step-by-step explanation:

I assume there's a negative sign missing, since the image is a downwards parabola.

f(x) = -x²/256 + 16

The width of the beam is the distance between the x-intercepts.

0 = -x²/256 + 16

x²/256 = 16

x² = 4096

x = ±64

So the width is:

64 − (-64) = 128

The angular speed of the wheel at its point of contact on the surface is 8 radians per second.

Given that:

A wheel is rolling on a horizontal surface.

The radius of the wheel, r = 0.5 m

The velocity of the axle of the wheel is constant.

Here, the linear velocity can be found by taking the ratio of the distance to the time taken to cover that distance.

So, the linear speed is:

[tex]\text{v}=\frac{20}{5}[/tex]

  [tex]=4 \text{ m/s}[/tex]

Now, the relationship between the angular speed and the linear speed is:

[tex]\omega=\frac{v}{r}[/tex]

  [tex]=\frac{4}{0.5}[/tex]

  [tex]=8[/tex] rad/s

Hence, the angular speed is 8 radians per second.

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The angular speed of the wheel about its point of contact on the surface is 8 rad/s.

To find the angular speed of the wheel about its point of contact on the surface, we can use the relationship between linear and angular velocity.

The linear velocity of a point on the wheel is given by:

v = ω * r

Where:

v is the linear velocity

ω is the angular velocity (angular speed)

r is the radius of the wheel

In this case, we know that the wheel rolls without slipping, which means the linear velocity of the point of contact with the surface is equal to the velocity of the axle. Since the axle moves a distance of 20 m in 5 s, the linear velocity can be calculated as:

v = 20 m / 5 s = 4 m/s

Given that the radius of the wheel is 0.5 m, we can rearrange the equation to solve for ω:

ω = v / r

ω = 4 m/s / 0.5 m

ω = 8 rad/s

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Answer:

[tex] \frac{16}{7(x + 4)} + \frac{5}{7(x - 3)} [/tex]

your answer is not correct.

Answer:

Step-by-step explanation:

160+112n=180k

112n=180k-160

for k=1

180-160=20(not divisible by 112)

k=2

180*2-160=360-160=200(not divisible by 112)

k=3

180*3-160=540-160=380(not divisible by 112)

180*4-160=720-160=560(divisible by 112)

so number of sides=560/112 +1=5+1=6

or (n-2)180=720

n-2=720/180=4

n=4+2=6

Answer:

6

Step-by-step explanation:

The sum of interior angle of a polygon is (n - 2)180.

But in the convex polygon given in the question, we know that the sum of the interior angles is as follows: : 160 + 112(n - 1)

Equating both will yield the following:

180n -360 = 112n - 112 + 160

180n - 360 = 112n + 48

180n - 112n = 360 + 48

68n = 408

n = 408/68 = 6

Hence , the convex polygon has 6 sides

Evan would have to pay $10.50 to the pizza shop if he bought 7 slices of pizza. The monthly cost for x slices of pizza would be $1.50x.

Evan purchased a membership to a pizza shop that has a membership program for frequent buyers. The membership costs $5 per month and members get a discounted price of $1.50 per slice of pizza. If Evan bought 7 slices of pizza this month, he would have to pay $1.50 per slice, since he is a member. Therefore, Evan would have to pay 7 x $1.50 = $10.50 to the pizza shop.

The monthly cost for x slices of pizza can be calculated by multiplying the cost per slice ($1.50) by the number of slices (x). So, the monthly cost for x slices would be x x $1.50 = $1.50x.

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Using a ruler/straight edge to draw a vertical line for any values of x.If the curve is cut more than once, the graph is not for a function.

Step-by-step explanation:

Use a ruler to draw a line parallel to the y-axis for the taken values of x.When the vertical line is drawn, observe how the line intersect the graph. If the line intersects the graph more than once for nay value of x then that is not a graph of a function.

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Answer:

Alternate Hypothesis: The true weight of the piglets is greater than or equal to 39 lbs.

Step-by-step explanation:

Hypothesis testing is more like a binary process in which only one (Either Null or Alternate Hypothesis can be true) and we have to infer that whether our Null hypothesis is true or false.

The hypothesis testing involves following 4 general steps:

As in the given question, if a number (X) is less than another number (Y) then it can't be less, equal or greater simultaneously.

There are 14 toys in Zoey's basket.

Step-by-step explanation:

Given,

Balls in basket = 3

Stuffed animals = 2 times as balls in basket

Stuffed animals = 2*3 = 6

Bones = 1 fewer than stuffed animals.

Fewer means subtraction

Bones = 6-1 = 5

Total toys = Balls + stuffed animals + bones

Total toys= 3+6+5 = 14

There are 14 toys in Zoey's basket.

Keywords: addition, multiplication

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Answer:

I would approach it with a graph or chart because that is the best way to go about a problem like this. don't quote me on this though because im only a freshmen in highschool. I hope this helps>

Step-by-step explanation:

Answer:

The question is not complete; the options are not given.

This is the complete question

Which of the following approaches is most suitable for auditing the finance and investment cycle?

a) perform extensive tests of controls and limit substantive procedures to analytical procedures

b) Ignore internal controls and perform extensive substantive procedures

c) Gain an understanding of internal controls and perform extensive substantive procedures

d) Ignore internal controls and limit substantive procedures to analytical procedures

Step-by-step explanation:

The right option is option c)

Gain an understanding of internal controls and perform extensive substantive procedures.

The approaches which is most suitable for auditing the finance and investment cycle is gaining an understanding of internal controls and perform extensive substantive procedures. Which makes option c the right option.

Answer:

C. 54π + 20.25√3 cm²

Step-by-step explanation:

The shaded area can be split into two areas: a sector and an isosceles triangle.

Area of a sector is:

A = (θ/360°) πr²

where θ is the central angle and r is the radius.

Area of an isosceles triangle can be found with SAS formula:

A = ½ ab sin θ

where a and b are two sides of a triangle and θ is the angle between them.

In this case, r = a = b = 9 cm.  The central angle of the sector is 240°, and the vertex angle of the triangle is 120°.  Therefore, the total area is:

A = (240°/360°) π (9 cm)² + ½ (9 cm) (9 cm) sin 120°

A = 54π + 20.25√3 cm²

Answer:

p(0) = 35

Step-by-step explanation:

-3, √7 and 1-√6 are all roots, hence, we can factorize (x-(-3)) = (x+3), (x-√7) and (x- (1-√6)) = (x-1+√6) from p. Since p has rational coefficients, then we need to cancel out both √7 and √6. To do so we should multiply by the rational conjugate, of the expressions (x-1+√6) and (x-√7), that means, where a square root of a non square positive number appears, place the opposing sign there.

The rational conjugate of (x-√7) is (x+√7), and

(x-√7)*(x+√7) = x²-7

On the other hand, the rational conjugate of (x-1+√6) is (x-1-√6), and

(x-1+√6) * (x-1-√6) = ( (x-1) + √6) * ((x-1) -√6) = (x-1)² - √6² = x²-2x+1-6 = x²-2x-5.

Thus, both x²-7 and x²-2x-5 are factors of p. The polynomial has the form

[tex]P(x) = c(x+3)(x^2-7)(x^2-2x-5)[/tex]

Where c is a constant. To determine c, we need to use the other piece of information given: p(-1) = 8

When we evaluate in -1, we get

[tex]p(-1) = c*(-1+3)((-1)^2-7)((-1)^2-2(-1)-5) = c* 2*(-6)*(-2) = c*24 = 8[/tex]

Thus, c = 8/24 = 1/3.

Therefore,

[tex]p(0) = \frac{1}{3} * (0+3)(0^2-7)(0^2-2*0-5) = \frac{1}{3}*3*(-7)*(-5) = 35[/tex]

I hope that works for you!

Answer:

Cost in decreasing order: Project B>Project A>Project D>Project C

Step-by-step explanation:

Project A

Area:  [tex]A=20 in*15 in= 300 in^2[/tex]

Scale: [tex]S=\frac{4 ft *4ft}{1 in*1in}=16 \frac{ft^2}{in^2}[/tex]

Cost:

[tex]C=\frac{22000}{300 in^2*16 \frac{ft^2}{in^2}}[/tex]

[tex]C=\frac{4.58}{ft^2}[/tex]

Project B

Area:  [tex]A=10 in*8 in= 80 in^2[/tex]

Scale: [tex]S=\frac{8 ft *8ft}{1 in*1in}=64 \frac{ft^2}{in^2}[/tex]

Cost:

[tex]C=\frac{25000}{80 in^2*64 \frac{ft^2}{in^2}}[/tex]

[tex]C=\frac{4.88}{ft^2}[/tex]

Project C

Area:  [tex]A=15 in*12 in= 180 in^2[/tex]

Scale: [tex]S=\frac{6 ft *6ft}{1 in*1in}=36 \frac{ft^2}{in^2}[/tex]

Cost:

[tex]C=\frac{27000}{180 in^2*36 \frac{ft^2}{in^2}}[/tex]

[tex]C=\frac{4.16}{ft^2}[/tex]

Project D

Area:  [tex]A=8 in*6 in=48 in^2[/tex]

Scale: [tex]S=\frac{12 ft *12ft}{1 in*1in}=144 \frac{ft^2}{in^2}[/tex]

Cost:

[tex]C=\frac{30000}{48 in^2*144 \frac{ft^2}{in^2}}[/tex]

[tex]C=\frac{4.34}{ft^2}[/tex]

Answer:

b. The graph of the new line is less steep than the graph of the original line, and the y-intercept has been translated up

Option b is right.

Step-by-step explanation:

Given that linear function f(x)=x is graphed on a coordinate plane.

The graph of a new line is formed by changing the slope of the original line to 2/3 and the y-intercept to 4.

The original slope was 1. Now changed to 2/3 i.e. slope is reduced. Hence the new line will be less steeper.

Also original line y =x has y intercept at the origin.

By changing y intercept to 4, we changed y intercept to upwards by 4 units.

Thus there is a vertical shift of 4 units.

b. The graph of the new line is less steep than the graph of the original line, and the y-intercept has been translated up

Option b is right.

A linear function is represented by a straight line.

The true statement is: (b) the graph of the new line is less steep than the graph of the original line, and the y-intercept has been translated up.

The function f(x) is given as:

[tex]\mathbf{f(x) = x}[/tex]

The attributes of the new function are:

So, the new function is:

[tex]\mathbf{f'(x) = \frac23x + 4}[/tex]

The slope of [tex]\mathbf{f(x) = x}[/tex] is 1.

2/3 is less than 1.

So, the new line is less steep

The y-intercept (4) means that:

The new line is shifted up by 4 units

Hence, the correct statement is: (b)

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Answer:

Flame has 14 trees, Sally has 7 trees and Frazer has 10 trees.

Step-by-step explanation:

Given;

Total Trees = 31

Let the number of trees Flame has be 'x'.

Now given:

Sally has 7 fewer trees than Flame.

framing in equation form we get;

Number of trees Sally has  = [tex]x-7[/tex]

Also Given:

Frazer has 3 more trees than Sally.

framing on equation form we get;

Number of trees Frazer has = [tex]x-7+3 = x-4[/tex]

Now We know that Captain salamander total trees in 3 friends.

Hence we can say that;

Total Number of trees is equal to sum of number of trees Flame has and Number of trees Sally has and Number of trees Frazer has.

framing in equation form we get;

[tex]x+(x-7)+(x-4)=31\\\\x+x-7+x-4=31\\\\3x-11=31\\\\3x=31+11\\\\3x = 42\\\\x = \frac{42}{3} = 14[/tex]

Hence Number of trees Flame has = 14 trees

Number of trees Sally has = [tex]x-7 = 14-7 =7 \ trees[/tex]

Number of trees Frazer has = [tex]x-4 = 14-4 = 10 \ trees[/tex]

Hence Flame has 14 trees, Sally has 7 trees and Frazer has 10 trees.

Answer:

33 ft

Step-by-step explanation:

sin( angle ) = opposite / hypotenuse

Answer:

Step-by-step explanation:

[tex]sin (x)=-0.8\\x+y=90\\x=90-y\\sin(90-y)=-0.8\\cos (y)=-0.8\\sin (90-\alpha )=cos\alpha[/tex]

Answer:

cos x

Step-by-step explanation:

Answer:

-0.5

Step-by-step explanation:

The correlation coefficient represents the relationship between two variables and here two variables are anxiety symptoms and life satisfaction. As it is mentioned in the statement that less anxiety symptoms are present in the individuals who have higher life satisfaction, so there is negative/ inverse relationship between anxiety symptoms and life satisfaction. Just to be clear the inverse relationship means that increase in one variable lead to decrease in second variable and vice versa. Also according to rule of thumb 0.5 represents the moderation correlation because correlation coefficient ranges from -1 to +1 and 0.5 is a middle value. So the correlation coefficient in the given scenario is -0.5.

Answer:

And we got [tex]\alpha/2 =0.01[/tex] so then the value for [tex]\alpha=0.02[/tex] and then the confidence level is given by: [tex]Conf=1-0.02=0.98[/tex[ or 98%

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

[tex]p_1[/tex] represent the real population proportion for 1

[tex]\hat p_1 =0.768[/tex] represent the estimated proportion for 1

[tex]n_1=92[/tex] is the sample size required for 1

[tex]p_2[/tex] represent the real population proportion for 2

[tex]\hat p_2 =0.646[/tex] represent the estimated proportion for 2

[tex]n_2=95[/tex] is the sample size required for 2

[tex]z[/tex] represent the critical value for the margin of error  

The population proportion have the following distribution  

[tex]p \sim N(p,\sqrt{\frac{p(1-p)}{n}})[/tex]  

The confidence interval for the difference of two proportions would be given by this formula  

[tex](\hat p_1 -\hat p_2) \pm z_{\alpha/2} \sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1} +\frac{\hat p_2 (1-\hat p_2)}{n_2}}[/tex]  

For this case we have the confidence interval given by: (-0.0313,0.2753). From this we can find the margin of erro on this way:

[tex]ME= \frac{0.2753-(-0.0313)}{2}=0.1533[/tex]

And we know that the margin of erro is given by:

[tex]ME=z_{\alpha/2} \sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1} +\frac{\hat p_2 (1-\hat p_2)}{n_2}}[/tex]

We have all the values except the value for [tex]z_{\alpha/2}[/tex]

So we can find it like this:

[tex]0.1533=z_{\alpha/2} \sqrt{\frac{0.768(1-0.768)}{92} +\frac{0.646 (1-0.646)}{95}}[/tex]

And solving for [tex]z_{\alpha/2}[/tex] we got:

[tex]z_{\alpha/2}=2.326[/tex]

And we can find the value for [tex]\alpha/2[/tex] with the following excel code:

"=1-NORM.DIST(2.326,0,1,TRUE)"

And we got [tex]\alpha/2 =0.01[/tex] so then the value for [tex]\alpha=0.02[/tex] and then the confidence level is given by: [tex]Conf=1-0.02=0.98[/tex] or 98%

The confidence level is 95%. This conclusion is reached by converting the upper bound of the confidence interval into a standard z-score and comparing it to the z-scores for common confidence levels.

To determine the confidence level of interval, we need to look at the proportion of the total area under the standard normal curve that falls within the interval when converted into a standard z-score. For instance, a 90% confidence interval corresponds to an area of 0.90 under the curve, with 0.05 in each tail, and a Z score of ±1.645. A 95% confidence interval corresponds to an area of 0.95 under the curve, with 0.025 in each tail, and a Z score of ±1.96. A 99% confidence level corresponds to an area 0.99 under the curve, with 0.005 in each tail, and a Z score of ±2.575.

In this case, with a confidence interval of (-0.0313, 0.2753) and the estimated proportions of p1=0.768 and p2=0.646, we find the estimated difference is 0.122 and its standard deviation is 0.0782.

Converting the upper bound of the confidence interval into a standard z-score: (0.2753 - 0.122) / 0.0782 = 1.959, which corresponds to a 95% confidence level. Thus, the inference can be that if we were to sample from these populations many times, in 95% of the cases, the true difference between p1 and p2 would lie within the interval (-0.0313, 0.2753).

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To find the approximate probability that the total amount paid for the second movies will exceed $15.00 is (a) 0.91, we need to use the expected value and standard deviation to calculate a z-score and then find the corresponding probability.

To find the approximate probability that the total amount paid for the second movies will exceed $15.00, we need to use the expected value and standard deviation to calculate a z-score and then find the corresponding probability. First, we calculate the standard deviation using the formula: standard deviation = 0.15 * sqrt(30) = 0.2598.

Then, we calculate the z-score using the formula: z = (15 - 0.47) / 0.2598 = 57.05. Using a standard normal distribution table or a calculator, we find that the probability of getting a z-score greater than 57.05 is extremely close to 1.

Therefore, the approximate probability that the total amount paid for these second movies will exceed $15.00 is 0.91, option (a).

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Answer:

[tex]\displaystyle a_n=8+9(n-1)[/tex]

Correct option: C]

Step-by-step explanation:

Arithmetic Sequences

Each term in an arithmetic sequence is obtained as the previous term plus a constant number called the common difference. The general term is

[tex]\displaystyle a_n=a_1+(n-1).r[/tex]

We are given this information

[tex]\displaystyle a_1=8\ ,\ a_7=62[/tex]

Replacing those values in the formula

[tex]\displaystyle 62=8+(7-1).r[/tex]

Solving for r

[tex]\displaystyle r=\frac{62-8}{6}=\frac{54}{6}=9[/tex]

[tex]\displaystyle r=9[/tex]

The general term is, then

[tex]\displaystyle a_n=8+(n-1)9[/tex]

Or equivalently

[tex]\displaystyle a_n=8+9(n-1)[/tex]

Correct option: C]

Kira runs 144 miles in 9 weeks.

Step-by-step explanation:

Given,

Distance ran on Monday = 2.5 miles

Distance ran on Wednesday = 5.75 miles

Distance ran on Friday = 7.75 miles

Distance ran in one week = 2.5+5.75+7.75 = 16 miles

Distance ran in 9 weeks = Number of weeks * Distance ran in one week

Distance ran in 9 weeks = 16*9 = 144 miles

Kira runs 144 miles in 9 weeks.

Keywords: multiplication, addition

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Answer:

The correct answer is that the area of the regular octagon is 309 cm²

Step-by-step explanation:

There are several formulas for calculating the area of a regular octagon. We will use this one for solving this question because it does not require additional information .

Area = (2 * s²)/tan 22,5°

s = 8 cm

Replacing with the real values, we have:

Area = (2 * 8²)/tan 22,5°

Area = 2 * 64/0.4142

Area = 128/0.4142

Area = 309 cm² (Rounding to the nearest tenth)

Cos(Angle) = Adjacent leg / Hypotenuse

Cos(X) = 3.5/4.6

X = arccos(3.5/4.6)

X = 40.46 degrees.

Answer:

B. x=-6, y=2

Step-by-step explanation:

Answer:

  3

Step-by-step explanation:

63 can be factored as ...

  61 = 1×63 = 3×21 = 7×9

The only plan that meets Matthew's requirement for number of days is to read 21 pages on each of 3 days.

Answer:

C

Step-by-step explanation:

This is a combination question.

In the first instance, we select 5 from 20 and in the second case , we select 4 from 20.

The total number of ways to solve the first instance is 20C5 = 15504 ways

The total number of ways to solve the second instance is 20C4 = 4,845

The ratio of the first to the second scenario is 15,504/4,845 = 3.2 = 16 to 5