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Mrac [35]
3 years ago
7

Twenty more than four times a number is equal to the difference between −71 and three times the number. Find the number.

Mathematics
1 answer:
anzhelika [568]3 years ago
3 0

4x + 20 = - 71 - ( 3x )

4x + 20 = - 3x - 71

Subtract sides minus 20

4x + 20 - 20 = - 3x - 71 - 20

4x = - 3x - 91

Add sides 3x

4x + 3x = - 3x + 3x - 91

7x = - 91

Divide sides by 7

7x / 7 = - 91 / 7

Simplification

x = - 13

Thus the number is ( - 13 ) .

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3. The scale of a model car is 1:32.
Murljashka [212]

Answer: Third option.

Step-by-step explanation:

Let be "x" the approximate actual  width of the car (in feet).

According to the information provided in the exercise, you know that the scale of the model car is:

1:32

By definition, this can be written as a fraction:

\frac{1}{32}

Therefore, if you know that the width of the model car is 2.3 inches, you can set up the following proportion:

\frac{1}{32}=\frac{2.3}{x}

Finally, you must solve for "x" in order to find its value.

This is:

(x)(\frac{1}{32})=2.3\\\\x=(2.3)(32)\\\\x=73.6

3 0
4 years ago
A certain company's main source of income is a mobile app.
Anastasy [175]

Answer:

-66

Step-by-step explanation:

-66 is the correct answer. Hope it helps :)

5 0
3 years ago
What is an equation of the line through (3, -1) and (2, 14)?​
Elden [556K]

Step-by-step explanation:

no explanations.I have done the whole sum

3 0
3 years ago
Explain how to find the estimated sum of <br><br><br> 5<br> 8<br> +<br> 2<br> 9<br> .
mina [271]

The estimated sum of the numbers fifty-eight (58) and twenty-nine (29) is equal to ninety (90).

<h3>What is the difference between a regular sum and an estimated sum?</h3>

In an estimated sum, the numbers are rounded; on the other hand, in a regular sum, the numbers are not changed.

<h3>What is the estimated sum of 58 and 29?</h3>

1. Round the numbers:

  • 58 = 60 as this number is nearest to 60 than to 58.
  • 29= 30 because of the same reason explained above.

2. Add the rounded numbers:

  • 60 + 30 = 90

Learn more about estimated sum in: brainly.com/question/660898

#SPJ1

7 0
3 years ago
Please help<br><br>number 11​
nlexa [21]
X=4
JK=17
JM=19
KM=17
This is the answer
8 0
3 years ago
Read 2 more answers
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