a day care program has an average daily expense of $75 the standard deviation is $5 the owner takes a sample of 64 bills what is the probability the mean of his sample will be between $70 and $80? The answer choices are 68 1.0 34 + 30. Step 1 calculate a z-score for $70 step to give the probability for Step 1. Step 3 calculate the Z score for $80. Step for give the probability for step 3.

First to answer this take note of how much he spends and how much it cost,

456 is the total cost and it is 3 a gallon

To figure how many gallons he got divide 456 by 3

456/3=152

Hello!

To find the equation of the line with a y-intercept of (0, -3) and a x-intercept of (-4.5, 0), we need to use the slope formula.

The slope formula is [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex].

With that, we substitute the given ordered pairs into the formula, and solve.

[tex]\frac{0 - (-3)}{-4.5 - 0} = \frac{3}{-4.5} =\frac{3}{-\frac{9}{2} } = -\frac{2}{3}[/tex]

The slope of this line is -2/3 or -0.667 repeated (doesn't specify).

Therefore, the equation of the line is y = -2/3x - 3. (I also included the graph!) :-)

X= amount of rides

Y=total price (33.50)

Equation: 0.75(18) + X = 33.50

                     13.50+ X=33.50

                    -13.50      -13.50

                                X=20.00

Admission=20.00

Answer:

Part a) [tex]x=18\ tickets[/tex], [tex]y=\$33.50[/tex]

Part b) [tex]y=0.75x+20[/tex]

Step-by-step explanation:

Let

x------>  the number of ride tickets.

k-----> constant that represent the cost for festival admission

y----> the total cost

we know that

[tex]y=0.75x+k[/tex]

we have that

[tex]x=18\ tickets[/tex]

[tex]y=\$33.50[/tex]

substitute the values

[tex]33.50=0.75(18)+k[/tex]

solve for k

[tex]k=33.50-0.75(18)[/tex]

[tex]k=\$20[/tex]

The linear equation to calculate the cost for anyone who only pays for festival admission and rides is equal to

[tex]y=0.75x+20[/tex]

The percentage increased by 42.86%.

To calculate the percentage increase:

First: work out the difference (increase) between the two numbers you are comparing.

Increase = New Number - Original Number

Then: divide the increase by the original number and multiply the answer by 100.

% increase = Increase ÷ Original Number × 100.

If your answer is a negative number then this is a percentage decrease.

Answer:

Marked-down price: $19.99

Step-by-step explanation:

The markdown amount is ...

$29.99×33 1/3% = $10.00 . . . . . 9.99667 rounded up

The marked-down price is the original price less the markdown:

$29.99 - 10.00 = $19.99

_____

You will recognize that 33 1/3% = 1/3, so that the calculation is ...

[tex]\text{markdown}\,=\dfrac{\$29.99}{3}=\$9.99\overline{6}\approx\$10.00[/tex]

Let x equal the number of books in the box.

x* 1/6 = 8

Multiply each side by 6

x=48 books

The correct answer is B) 48 books.

To determine how many books a completely full box would hold, we need to consider the information given:

The box contains 8 books and it is 1/6 full. To find out how many books would be in the box if it were completely full, we need to set up a proportion:

[tex]\(\frac{8}{\frac{1}{6}} = \frac{8 imes 6}{1} = 48\)[/tex]

This means the box can hold 48 books when full.

So, the correct answer is:

B) 48 books

10 1/2 golf balls to get it

For the first one,

x = 10.

For the second one,

x = 12

x = [tex]\frac{60}{9}[/tex] and x = [tex]\frac{45}{8}[/tex]

Since in both cases the figures are similar then the ratios of corresponding sides are equal

[tex]\frac{x}{15}[/tex] = [tex]\frac{4}{9}[/tex] ( cross- multiply )

9x = 60 ( divide both sides by 9 )

x = [tex]\frac{60}{9}[/tex]

and [tex]\frac{x}{5}[/tex] = [tex]\frac{9}{8}[/tex]

8x = 45 ( divide both sides by 8 )

x = [tex]\frac{45}{8}[/tex]

A graph shows zeros near -1.449 and +3.449. These suggest that one factor is the quadratic (x -1)² -6. That makes the other quadratic factor be (x -0.5)² +0.75. So, the complete factorization in integers is

... f(x) = (x² -2x -5)(x² -x +1)

The two real roots are near ...

... d. -1.4, 3.4

∠KLM = 36°

the angle bisector divides ∠NLK into 2 equal angles

∠NLK = ∠NLM + ∠KLM

since ∠NLK = 72° then ∠NLM = ∠KLM = 36°

b = - 252 and c = - 1126

the equation of a parabola in vertex form is

y a(x - h)² + k

where (h, k) are the coordinates of the vertex and a is a multiplier

y = - 14(x + 9)² + 8 ← equation in vertex form

expand and compare coefficients

y = - 14(x² + 18x + 81 ) + 8 = - 14x² - 252x - 1134 + 8

compare to y = - 14x² + bx + c

b = - 252 and c = - 1126

your answer would be 9h

the equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y-intercept )

y = 2x + 10 is in this form

To express in functional notation replace y by f(x), thus

f(x) = 2x + 10

(1)

given [tex]\frac{j}{6}[/tex] = [tex]\frac{9}{10}[/tex] ( cross- multiply )

10j = 54 ( divide both sides by 10 )

j = [tex]\frac{54}{10}[/tex] = [tex]\frac{27}{5}[/tex] ← in simplest form

(9)

let h be the hours worked daily , then

3h = 20 [tex]\frac{2}{3}[/tex] = [tex]\frac{62}{3}[/tex] ( divide both sides by 3 )

h = [tex]\frac{62}{3}[/tex] ÷ 3

  = [tex]\frac{62}{3}[/tex] × [tex]\frac{1}{3}[/tex] = [tex]\frac{62}{9}[/tex] = 6 [tex]\frac{8}{9}[/tex]

She worked  6 [tex]\frac{8}{9}[/tex] hours each day

This is a cubic form. I am assuming this should be factored.

With cubics like this it's worthwhile trying to find one root by simply guessing. My guess that worked out is x=-2

To verify:

3(-2)^3+7(-2)^2+(-2)-2 = 0   -> so -2 is a root and we get the first factor: (x+2)

Next we divide the cubic by the factor (x+2). I let you do the division. Here is the result

(3x^3 +7x^2 +x -2):(x+2) = (3 x^2 + x - 1)

(3 x^2 + x - 1) is a quadratic form and you can use the quadratic formula to get the two other roots. I got  [tex]\frac{-1\pm \sqrt{13}}{6}[/tex].

So the entire cubic is now factored as follows:

[tex](x+2) \cdot (x+ \frac{-1+ \sqrt{13}}{6}) \cdot (x+ \frac{-1- \sqrt{13}}{6})[/tex]

[tex]f^{-1}[/tex](x) = [tex]\frac{2x}{x-3}[/tex]

let y = f(x), then rearrange making x the subject

y = [tex]\frac{3x}{x-2}[/tex] ( multiply both sides by (x - 2 ))

y(x - 2 ) = 3x (distribute )

xy - 2y = 3x ( subtract 3x and add 2y to both sides )

xy - 3x = 2y (factor out x on left side )

x(y - 3 ) = 2y ( divide both sides by (y - 3) )

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

change y to x for inverse function

[tex]f^{-1}[/tex](x) = [tex]\frac{2x}{x-3}[/tex]

Biconditionals are statements that work both ways.

Some examples:

If it rains, I go out, and if I go out, it must be raining.

This can be stated concisely in mathematical terms as

I go out IF AND ONLY IF it rains.

So looking at the given statements, only the last two work both ways, namely:

If the sun rises in the east, then it is morning, and if it is morning, the sun rises in the east.

Victoria will play outside if and only if the weather is nice.

Answer:

Step-by-step explanation:

Final answer:

The percent of decrease for the magazine's subscription is 20%.

Explanation:

To find the percent of decrease for the magazine's subscription, we need to calculate the difference between the original price and the new price, and then divide it by the original price.

The decrease in price is $66 - $52.80 = $13.20.

The percent of decrease is ($13.20 / $66) * 100% = 20%.

Answer:

adults = 40

children = 68

Step-by-step explanation:

Let the children=c

Let the adults = a

Equations

a + c = 108                 (1)

3.75a + 1.5c = 252    (2)

Multiply (1) by 1.5

1.5a + 1.5c = 162        (3)

Subtract (3) from (2)

3.75a + 1.5c = 252

1.5   a + 1.5c = 162    Subtract

2.25a             = 90   Divide by 2.25

a = 90/2.25

a = 40

Find the number of children

a + c = 108

40 + c = 108

c = 108 - 40

c = 68

Check

LHS

3.75 * 40 + 1.50 * 68

150 + 102

252 Which checks with the right hand side.

4.  Supplementary angles together make a straight line (two right angles).  So BOE is supplementary to BOC

Answer: ∠BOE

5. Distance and midpoint between (4,-2), (6,8)

[tex]d = \sqrt{ (6-4)^2 + (8 - -2)^2} = \sqrt{2^2+10^2}=\sqrt{104}=2 \sqrt{26}[/tex]

midpoint

[tex]\left(\dfrac{4 + 6}{2}, \dfrac{-2 + 8}{2} \right) = (5, 3)[/tex]

Answer: distance 2√26, midpoint  (5, 3)

6.That's a rectangle oriented parallel to the axes, width parallel to the x axis of 7 - -3 = 10 and length along y of  1 - - 4 = 5, so an area of 10(5)=50

Answer: 50

Answer:

a = 12 units

Step-by-step explanation:

Equation given is [tex]a^2 + 16^2 = 20^2[/tex]

First we have to evaluate the powers.

[tex]16^{2}[/tex] = [tex]16*16[/tex]=[tex]256[/tex]

[tex]20^{2}[/tex] = [tex]20*20[/tex]=[tex]400[/tex]

So we can now write the equation again as:

[tex]a^2 +256  =400[/tex]

Now we have to undo the addition,

[tex]a^2=400-256 [/tex]

[tex]a^2=144 [/tex]

Now we have to find the square root of [tex]a^2[/tex] to get the value of [tex]a[/tex]

[tex]\sqrt{a^{2}} = \sqrt{144}[/tex]

[tex]a=12[/tex]  or [tex]a=-12[/tex]

But the length of a leg cannot be a negative value, so we can take the +12.

a = 12 units

Answer:

a = 12 units

Step-by-step explanation:

You are asking for the proportion of numbers 1–6 that are greater than 2. The ones greater than 2 are 3, 4, 5, 6. There are 4 of them, out of the 6 possible numbers. Since the cube is fair, all numbers have equal probability. This means the probability of an outcome greater than 2 is

... 4/6 = 2/3

The appropriat choice is ...

... C.) 2/3

Answer:

Jimmy run in t minute =  [tex]\frac{m*t}{60}[/tex] miles.

Step-by-step explanation:

Given  : Jimmy ran with the speed of m miles per hour.

To find : How far did he run in t minutes.

Solution : We have given

Speed  = m miles per hour .

Speed =  [tex]\frac{Distance}{time}[/tex].

We can say in 1 hour Jimmy ran =m  miles.

1 hour = 60 minute .

Jimmy ran in 60 minute = m miles .

Jimmy run in 1 minute = [tex]\frac{m}{60}[/tex] miles.

Jimmy run in t minute =  [tex]\frac{m}{60}* t[/tex] miles.

Jimmy run in t minute =  [tex]\frac{m*t}{60}[/tex] miles.

Therefore, Jimmy run in t minute =  [tex]\frac{m*t}{60}[/tex] miles.

The distance covered by Jimmy after t minutes is

[tex]m \: \times ( \frac{t}{60} )[/tex]

Recall :

Distance = Speed × Time

Speed = m miles per hour

Time = t minutes

Converting t to hours :

Recall :

1 hour = 60 minutes

t minutes = t/60 hours

Multiplying Jimmy's speed by the number of minutes run

Distance covered :

[tex]m \: \times ( \frac{t}{60} )[/tex]

Learn more : https://brainly.com/question/11236233

The sum of the interior angles in a triangle is 180°. To find the value of x, you must subtract 47 and 71 from 180.

180-47-71=x

x=62

The answer is A. 62°

Answer:

7 ft.

Step-by-step explanation:

1 ft./12 in. = x/84

Cross multiply:

1 × 84 = 84

x · 12 = 12x

12x = 84

12x/12 = 84/12

12x/12 = x

84/12 = 7

Ans. x = 7

Hope this helps! :)

There are 7 feet in 84 inches.

Given that we need to determine that how many feet in 84 inches.

To convert inches to feet, you need to divide the number of inches by the number of inches in a foot.

There are 12 inches in a foot.

Given that you have 84 inches, you can divide this value by 12 to find the equivalent in feet:

84 inches ÷ 12 inches/foot = 7 feet

So, 84 inches is equal to 7 feet.

Hence there are 7 feet in 84 inches.

Learn more about unit conversion click

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Answer:

C. (12, 0)

Step-by-step explanation:

Try the choices:

A. 10 > -3 -7·10 . . . true

B. 10 > 0 -7·7 . . . . true

C. 10 > 12 -7·0 . . . false . . . this is your answer

D. 10 > 2 -7·10 . . . true

The option that is not a solution of the inequality 10 > x - 7y is C. (12, 0), as substituting these values into the inequality gives 10 > 12, which is false.

To find out which option is not a solution of the inequality 10 > x
- 7y, we need to substitute the values of x and y from each given pair into the inequality and check if it holds true.

The only option that does not satisfy the inequality is C. (12, 0), because 10 is not greater than 12.

Multiply each term in the parentheses by 10x.  (This is the Distributive Law).:-

10x*6x^2 +10x*7x + 10x*9

= 60x^3 + 70x^2 + 90x    

12600 x  to the power of 2 + 37887 x + 40829

f(x+h)-f(x) / h

f(x) = 2x^2-3x-4

Replace X with (x+h):

2(x+h)^2 - 3(x+h) -4

Simplify:

2x^2 + 4hx +2h^2 -3x -3h -4

Now you have:

(2x^2 + 4hx +2h^2 -3x -3h -4 - 2x^2-3x-4) / h

Simplify to get 4x +2h-3

The answer is C.

            50*2= 100

               So 50 is one half of One hundred and if we use 100 divided by 2 to get 50 then we need to do 80 / 2 which will give us 40.

The odds in favor of picking a white marble from a bag with 4 green and 5 white marbles are 5 to 4.

This is calculated by comparing the number of white marbles to the number of green marbles.

To determine the odds in favor of picking a white marble from a bag containing 4 green marbles and 5 white marbles, we need to calculate the ratio of the number of successful outcomes (picking a white marble) to the number of unsuccessful outcomes (not picking a white marble).

In this case, the successful outcomes are the 5 white marbles, and the unsuccessful outcomes are the non-white marbles, i.e., the 4 green marbles.

The odds in favor are therefore 5 to 4, or simply, 5:4.

Here's how to calculate odds using a probability example:

So, the odds in favor of picking a white marble are 5 to 4.