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tatiyna
3 years ago
7

Going into the final​ exam, which will count as two​ tests, Brandi has test scores of 75, 80, 74, 63, and 92. What score does Br

andi need on the final in order to have an average score of​ 80?
Mathematics
1 answer:
NeX [460]3 years ago
4 0

Answer:

96

Step-by-step explanation:

Do 480 divided by six. She took six tests, so in order to find a average you need to do 480 (74+80+75+63+92+96) divided by six which will equal EXACTLY 80.

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The line perpendicular to y= (-3/2)x -4 and goes through (1,4)
Paladinen [302]

Answer <u>(assuming it is allowed to be in point-slope format)</u>:

y-4 = \frac{2}{3}(x-1)

Step-by-step explanation:

1) First, determine the slope. We know it has to be perpendicular to the given equation, y = -\frac{3}{2} x-4. That equation is already in slope-intercept form, or y = mx + b format, in which m represents the slope. Since -\frac{3}{2} is in place of the m in the equation, that must be the slope of the given line.

Slopes that are perpendicular are opposite reciprocals of each other (they have different signs, and the denominators and numerators switch places). Thus, the slope of the new line must be \frac{2}{3}.  

2) Now, use the point-slope formula, y-y_1 = m (x-x_1) to write the new equation with the given information. Substitute m, x_1, and y_1 for real values.

The m represents the slope, so substitute \frac{2}{3} in its place. The x_1 and y_1 represent the x and y values of a point the line intersects. Since the point crosses (1,4), substitute 1 for x_1 and 4 for y_1. This gives the following equation and answer:

y-4 = \frac{2}{3}(x-1)

3 0
3 years ago
Find surface area <br> Please show full working out
NemiM [27]
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Sorry if it’s incorrect ;-;

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4 years ago
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Step-by-step explanation:

7 0
3 years ago
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g You manage an ice cream factory that makes two flavors: Creamy Vanilla and Continental Mocha. Into each quart of Creamy Vanill
iragen [17]

Answer:

You should make 200 quarts of Creamy Vanilla and 50 quarts of Continental Mocha to earn the largest profit.

Step-by-step explanation:

You are going to earn the largest profit when you manage to use all the eggs and cups of cream that you have in stock.

This problem can be solved by a first order equation

I am going to call x the number of quarts of Creamy Vanilla and y the number of quarts of Continental Mocha.

The problem states that each quart of Creamy Vanilla uses 2 eggs and each quart of Continental Mocha uses 1 egg. There are 450 eggs in stock, so:

2x + y = 450.

The problem also states that each quart of Creamy Vanilla uses 3 cups of cream and that each quart of Continental Mocha uses 3 cups of cream. There are 750 cups of cream in stock, so:

3x + 3y = 750

Now we have to solve the following system of equations

1) 2x + y = 450

2) 3x + 3y = 750

The first thing i am going to do is simplify the equation 2) by 3

2) 3(x+y)/3 = 750/3

2) x+y = 250

So now, we have the following system

1) 2x + y = 450

2) x + y = 250

I am going to write y as a function of x in 2), and replace in 1)

y = 250 - x

Replacing in 1)

2x + 250 - x = 450

2x - x = 450 - 250

x = 200

You should make 200 quarts of Creamy Vanilla

From 2), we have

y = 250 - x = 250 - 200 = 50

You should make 50 quarts of Continental Mocha

4 0
4 years ago
I don’t know. I think I’m doing something wrong. Answer the highlighted questions and show work.
pentagon [3]

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p = -4


18) 14a - 93 = 49 - 57a

14a = 142 - 57a

71a = 142

a = 2


20) 8v = 2(4v + 2)

8v = 8v + 4

No solution


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h = -3


24) 11n - 3 = 9 + 5n

6n = 12

n = 2


26) -9n - 12 = 8 - 4n

-5n - 12 = 8

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