Sophie answered 84% of the questions on her science test correctly. If she answered 21 questions correctly, how many questions were on the test?

Using the normal distribution, it is found that 55.7% of response times are between 4 and 6 minutes.

The z-score of a measure X of a normally distributed variable with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex] is given by:

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

For this problem, the mean and the standard deviation are given, respectively, by:

[tex]\mu = 4.5, \sigma = 1.2[/tex]

The proportion between 4 and 6 minutes is the p-value of Z when X = 6 subtracted by the p-value of Z when X = 4, hence:

X = 6:

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

Z = (6 - 4.5)/1.2

Z = 1.25

Z = 1.25 has a p-value of 0.8944.

X = 4:

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

Z = (4 - 4.5)/1.2

Z = -0.42

Z = -0.42 has a p-value of 0.3372.

0.8944 - 0.3372 = 0.5572 = 55.72%.

Hence:

55.7% of response times are between 4 and 6 minutes.

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h = 9.3 - V/πr² is an equivalent expression to V = πr²(9.3 - h) for cylindrical grain cilo.

Every three-dimensional item takes up space in some way. The volume of this area is what is used to describe it. The area occupied within an object's three-dimensional bounds is referred to as its volume. The object's capacity is another name for it.

Finding an object's volume can help us figure out how much of it will be needed to fill it, such as how much water will be needed to fill a bottle, aquarium, or water tank.

It is shown that Volume V = πr²(9.3 - h)

Lets divide both sides with πr²

V/πr² = πr²(9.3 - h)/πr²

         = 9.3 - h

Now, subtract 9.3 from both sides

V/πr²- 9.3  = 9.3 - h - 9.3

                 = -h

Now multiply both sides with -1

-1(V/πr²- 9.3) = -1(-h)

-V/πr² + 9.3 = h

⇒ h = 9.3 - V/πr²

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Answer:

-3/2

Step-by-step explanation:

x < -3/2

Answer:

(a) $878.24

(b) $848.30

(c) Amy would pay less for the golf clubs if she gets them directly from the distributor

Step-by-step explanation:

Part (a)

The wholesale price is $499. When the pro shop gets them from the distributor, it has to pay a mark-up of 10%. 10% expressed as decimal is 10/100 = 0.10

10% of 499 = 0.10 x 499 = 49.90

So total cost including markup for the pro shop is 499 + 49.90 = $548.90

We can compute this directly without computing mark-up cost using the formula

Cost = 499(1+0.10) = 499 x 1.1 = 548.90

The pro shop puts a mark up of 60% which in decimal is 60/100 = 0.6 on the above cost

So the price Amy pays = 548.90(1+0.6) = 548.90 (1.6) = $874.28

Part (b)

Wholesale price = $499

If Amy purchases directly from distributor there is a 70% markup on the wholesale price. 70% = 70/100 = 0.7

So the price Amy would have to pay = 499(1+0.7) = 499 x 1.7 = $848.30

Part (c)

Since the cost of purchasing directly from distributor is less than the cost of purchasing from pro shop the answer is

Amy would pay less for the golf clubs if she gets them directly from the distributor

Answer:

Step-by-step explanation:

Explanation:

1/4 = 0.25

0.25*360 = 90

90 white beans, 360-90 = 270 black beans

The ratio of white to black is 90:270 which fully simplifies to 1:3 after dividing both parts by the GCF 90.

The number of voters who are registered democrats according to the description in the task content is; 2,250.

In order words, the total number of registered voters as democrats from the above is 2,250

It follows from the task content that the number of voters who are registered democrats be determined.

On this note, since 3/8 of the total 6000 voters are registered democrats;

However, the number of registered democrats is;

(3/8) × 6000

= 2,250.

Ultimately, the total number of voters who are registered democrats from the above is; 2,250.

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The amount a person would have to deposit today to be able to take out 500$ a year for ten year from an amount earning 9% i

The formula for calculating amount is expressed as:

Amount = Principal + Interest

Determine the interest

Interest = 500*0.09 * 10

Interest = 5 * 90

Interest = $450

Principal= $500 - $450

Principal = $50

Hence the amount a person would have to deposit today to be able to take out 500$ a year for ten year from an amount earning 9% is $50

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Answer: Domain {-4,-2,2}

Range{4,6}

Step-by-step explanation:

Answer:

4.5 gallons of gas

Step-by-step explanation:

180 ÷ 40= 4.5

Answer:

4.5 gallons

Step-by-step explanation:

Proportions:

40 miles ⇒ 1 gallon

180 miles ⇒ D gallons

D = 180miles * 1 gallon / 40 miles

D = 4.5 Gallons

Answer:

Formulas for a rectangular prism:

Volume of Rectangular Prism: V = lwh.

Surface Area of Rectangular Prism: S = 2(lw + lh + wh)

Space Diagonal of Rectangular Prism: (similar to the distance between 2 points) d = √(l2 + w2 + h2)

If Werner Company produces and sells disposable foil baking pans to retailers for $2.25 per pan, and the variable cost per pan are [Direct materials $0.24, Direct labor 0.60, Variable factory overhead 0.73, Variable selling expense 0.17] while, fixed manufacturing cost totals $115,117 per year and Administrative cost (all fixed) totals $15,698, then:

1. 256,000 Pans must be sold for Werner to break even.

2. The unit variable cost is $1.74, and the unit variable manufacturing cost is $1.57.

3. 266400 pans must be sold for Werner to earn an operating income of $5,049.

4. A sales revenue of $599,400 must Werner have to earn operating income of $5,049.

First, we have to calculate the number of pans that must be sold for Werner to break even.

Given, Fixed manufacturing costs $115,117

And, Fixed administrative costs $15698

Therefore, Total fixed costs $[tex](115,117+15,698)=130,815[/tex]

Also given, Selling price per unit $2.25

And, total Variable costs per unit $[tex](0.24+0.60+0.73+0.17)=1.74[/tex]

Contribution margin per unit = $[tex](2.25-1.74)=0.51[/tex]

[Since, contribution margin is the difference of the selling price and the variable costs]

Now, formula to calculate Break-even units goes as

(Total fixed costs / unit contribution margin).

Therefore, Break-even units in our case = [tex]\frac{130,815}{0.51}=256,000[/tex] units.

Secondly, we are required to calculate the unit variable cost and the unit variable manufacturing cost.

The unit variable cost is already calculated to be $1.74.

And, the unit variable manufacturing cost is the sum of all the variable costs excluding the variable selling expense, i.e., [tex](1.74-0.17)=1.57[/tex].

Thirdly, we will have to calculate the number of pans must be sold for Werner to earn an operating income of $5,049.

Already calculated, Total fixed costs are $130,815 and Contribution margin per unit $0.51.

Given, target operating income is $5049.

Now, formula to calculate Desired Units to earn profit goes as

(Total fixed cost + Target operating income)/(Contribution margin),

i.e., in our case, [tex]\frac{130815+5049}{0.51} = \frac{135864}{0.51}=266400[/tex] unit pans must be sold for Werner to earn an operating income of $5,049.

Lastly, We need to calculate the sales revenue must Werner have to earn operating income of $5,049.

Since, [Sales revenue = (Desired units * selling price)]

And desired units = 266400, while Selling price per unit, given as $2.25.

Therefore, Sales revenue = [tex](266,400*2.25)=599,400[/tex].

That is, a sales revenue of $599,400 must Werner have to earn operating income of $5,049.

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The number of different ways to plan his trip is 240240

The given parameters are

Places, n = 14

Stops, r = 5

From the question, we understand that the places are in specific order

This represents permutation

So, the number of different ways to plan his trip is

Ways = [tex]^nP_r[/tex]

This gives

Ways = [tex]^{14}P_5[/tex]

Apply the permutation formula

Ways = 14!/9!

Evaluate

Ways = 240240

Hence, the number of different ways to plan his trip is  240240

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Answer:

Choice C

5x³ + 2x² - 4x  - 3

Step-by-step explanation:

(f + g)(x) = f(x) + g(x)

So simply add the two terms together

5x³ + 2x² -  7x + 4
                + 3x - 7
--------------------------
5x³ + 2x² - 4x  - 3

The apprοpriate dοmain fοr this situatiοn is t ≥ 0.

In mathematics, a functiοn is a relatiοn between a set οf inputs and a set οf pοssible οutputs with the prοperty that each input is related tο exactly οne οutput. It can be thοught οf as a rule οr a machine that takes inputs and prοduces οutputs accοrding tο a specific set οf instructiοns οr οperatiοns.

The dοmain οf a functiοn represents the set οf all pοssible input values fοr which the functiοn is defined. In this case, the functiοn h(t) represents the height οf the rοcket as a functiοn οf time t after launch.

Since time cannοt be negative in this cοntext (we can't have negative secοnds), the apprοpriate dοmain fοr this situatiοn is t ≥ 0, which means the functiοn is defined fοr all nοn-negative values οf t after the rοcket is launched.

Therefοre, the apprοpriate dοmain fοr this situatiοn is t ≥ 0.

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The image of the point (-1,-4) after a rotation of 90 counterclockwise about the origin is (4,-1)

What is coordinate system?

A coordinate system can be defined as the method used to  identifying the location of a point graphically. Most of the coordinate systems use two numbers generally x and y to define a  coordinate and to identify location of any point. The center of graph or system is known as origin and generally pointed as zero (0).

The 2 coordinates is generally written as x and y. There are generally 4 quadrants in 2d coordinate system. These are :

Now in the given question the point is (-1,-4)

i.e. the point lie in 4th quadrant (-x,-y)

If the point is rotated 90 degree counterclockwise then the point becomes (y , -x)

Thus, point (-1,-4) becomes (4,-1)

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Answer:

I'm pretty sure the answer is 6.

Step-by-step explanation:

Labeling the rooms A, B, and C makes it easier.

Room A - All BUT 4

Room B - All BUT 4

Room C - All BUT 4

Since you can see each room is all but four, you can split the 4 into 2 into 2 OTHER rooms than the one stated. For example, Room A is all but 4, so 2 go to Room B and the other 2 go to Room C because each room is all BUT 4.

Basically, 2+2+2 = 6

Answer:

A line is connected set of points that extends forever in both directions.

A line segment is a part of line with two end points.

A ray is a part of straight line that extends only in one direction from a fixed point.

Answer:

I can answer this is you provide a picture of the graph

Step-by-step explanation

The initial value of the graph is normally the y intercept of the graph. If you provide the graph linked to this question, I could answer it for you.

Answer:

10

Step-by-step explanation:

The inequalities to represent the situation is given as: x + y ≥ 36 and 2 x + 0.6 y < 40

The magnets are on sale for 60 cents each.

The key chains cost $2 each.

Katie must purchase at least 36 gifts but has to spend less than $40.

Now let x represent the amount of key chains.

Let y represent the amount of magnets.

So, the system of inequalities that form are:

x + y ≥ 36

and
2 x + 0.6 y < 40

Therefore, the inequalities to represent the situation is given as: x + y ≥ 36 and 2 x + 0.6 y < 40

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So matrix which show equation 4x+2y=4 is  [tex]\left[\begin{array}{ccc}4&2&4\\12&-1&26\end{array}\right][/tex] .

Given that we have an equation that is 4x+2y=4

So equation is a statement that the values of two mathematical expressions are equal (indicated by the sign =).

So in order to write this equation in matrix form we have to write it into augmented matrix

So augmented matrix is a matrix whose elements are the coefficients of a set of simultaneous linear equations with the constant terms of the equations entered in an added column.

Therefore the matrix will be:

[tex]\left[\begin{array}{ccc}4&2&4\\12&-1&26\end{array}\right][/tex]    .

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Answer: 120

Step-by-step explanation: Since the equation is asking for 24% percent of 500 we will have to solve by putting them both as fractions. 24 percent automatically means the denominator will be 100 so we have 24/100. 500 is the denominator since that's the base number we are trying to solve for 24% of 500. So we put x over 500. The equation will be:

24/100 x/500

We multiply diagonally so 24*500=12000.

We then divide 500 by 100 which equals 120.

The reason why we didn't multiply 100 and x is because we are trying to solve for x so we had to simplify each side until we got what x was equal to.

Answer:

She has 120 Red Marbles

Step-by-step explanation:

1% of 500= 5 so you can do 5x24 which would be 120.

I hope it helps you!

~XxBellsAloneXx~

a) The best description of the bias in the survey is A. Nonresponse bias.

b) To remedy this bias, B. The polling organization should try contacting households that do not respond by phone or face-to-face.

Nonresponse bias is the type of bias when survey participants are not interested in the survey or send an empty or unsatisfactory response.

Nonresponse bias means that the sample is filled with those who are not willing or able to respond, making the number of non-respondents surpass the number of respondents.

Thus, a response of 22/1,495 is too significant to be ignored, meaning that the nonresponse bias is much more critical.

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responded.

a) Which of these best describes the bias in the survey?

A. Nonresponse bias

B.  Sampling bias

C. Undercoverage bias

D. Response bias

b) How can the bias be remedied?

A. The polling organization should mail the questionnaire to a greater number of households.

B. The polling organization should try contacting households that do not respond by phone or face-to-face.

C. The polling organization should mail the questionnaire to each person in the household.

When the market price is $20, the number of cars that Denny will be willing to repair is 5 cars.

It should be noted that the total revenue will be:

= price × quantity

= 20 × s

= 20s

where s = number of cars

The marginal revenue will be 20.

The total cost is given as:

= 2s² + 10

The marginal cost will be 4s

We will equate the marginal. This will be:

4s = 20

Divide

s = 20/4

s = 5

Therefore, the number is 5.

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Answer: 3998 cents, or $39.98

Step-by-step explanation: Hope it helps!

The predicted area of the circle is 49.67 cm²

Given the expression that represents the least regression line as shown below:

log(Area) = 0.490 + 2.004log(time)

Given that the time after the stone is dropped is 4 seconds, the equivalent area is expressed as:

log(Area) = 0.490 + 2.004log(4)

log(Area) = 0.490 + 8.016

log(Area) = 1.6965cm

Area = 10^1.696

Area= 49.67 cm²

Hence the predicted area of the circle is 49.67 cm²

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The required equation for the statement 'four executive integers whose sum is 30' is 4n + 6 = 30

In this question, we have been given a  statement 'four executive integers whose sum is 30'

we need to write an equation for above statement.

Let n, n + 1, n + 2, n + 3 be four consecutive integers.

The sum of these four consecutive integers is 30.

⇒ n + n + 1 + n + 2 + n + 3 = 30

⇒ (n + n + n + n) + (1 + 2 + 3) = 30

⇒ 4n + 6 = 30

which is a required equation.

Therefore, the required equation for the statement 'four executive integers whose sum is 30' is 4n + 6 = 30

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3 and 17

7 and 13

Step-by-step explanation:

........

The amount that he owes will be $6610.54.

From the information, the base rental price was $30.45 per day plus 15 3/4 cents per mile. Mark drove 415.85 miles.

Therefore the amount that will be paid will be:

= ($30.45 × 2) + (15.75 × 415.85 miles)

= $60.90 + $6549.64

= $6610.54

The cost is $6610.54.

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