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serious [3.7K]
3 years ago
7

Max completed 12 questions on the exam. This is 40% of the questions. 1. Write an equation representing this situation. 2. How m

any questions are on the exam? 3. Explain how you got your answer
Mathematics
1 answer:
Marrrta [24]3 years ago
7 0

Answer:

Step-by-step explanation:

How many questions are on the exam?  Represent this by n.

Then 40% of n comes out to 12 questions, or more symbolically,

               0.40n = 12, after which we get n = 12/0.40 = 30

Answers:

(1)  0.40n = 12 is the desired equation.

(2) n = 30 is the number of questions on the exam.

(3) See above for explanations.

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The sum of seven and the quotient of a number xxx and eight.
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Answer:

7 + \frac{x}{8}

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Since 7 + x/8 is true since it's adding each other only after they divided.

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monitta

Answer:

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Step-by-step explanation:

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3 years ago
Which of the following have the correct solution? Check all
Neko [114]

Step-by-step explanation:

To do this, we will substitute the x values to their corresponding equations,

1)

2x + 5 \\  = 2(7) + 5 \\  = 14 + 5 \\  = 19

Given 2x + 15 = 19

Calculated 2x + 15 = 19

Given = Calculated, this solution is correct.

2)

3 + x + 2 -x \\  = 3 + 3 + 2 - 3 \\  = 8 - 3 \\  = 5

Given 3 + x + 2 - x = 16

Calculated 3 + x + 2 - x = 5

Given not equal to calculated, this solution is incorrect.

3)

\frac{x + 2}{5}  \\  =  \frac{8 + 2}{5}  \\  =  \frac{10}{5}  \\  = 2

Given (x+2)/5 = 2

Calculated (x+2)/5 = 2

Given = Calculated, this solution is correct.

4)

6 = 2x - 8 \\ 2x - 8 = 6

2x - 8  \\  = 2(7) - 8 \\  = 14 - 8 \\  = 6

Given 2x - 8 = 6

Calculated 2x - 8 = 6

Given = Calculated, this solution is correct.

5)

14 =  \frac{1}{3} x + 5 \\  \frac{1}{3} x + 5 = 14

\frac{1}{3} x + 5 \\  =  \frac{1}{3}(18) + 5 \\  =  \frac{18}{3}   + 5 \\  = 6 + 5 \\  = 11

Given 1/3x + 5 = 14

Calculated 1/3x + 5 = 11

Given not equal to Calculated, this solution is not correct.

Therefore the Correct solutions are 1,3 and 4.

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3 years ago
A cable that weighs 6 lb/ft is used to lift 600 lb of coal up a mine shaft 500 ft deep. Find the work done. Show how to approxim
Marysya12 [62]

Answer:

A cable that weighs 6 lb/ft is used to lift 600 lb of coal up a mine shaft 500 ft deep. Find the work done. Show how to approximate the required work by a Riemann sum.

Step-by-step explanation:

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