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Alik [6]
4 years ago
12

A rectangle has a length of 3x + 7 and a width of 2x - 1. If the perimeter of the rectangle is 42 meters. What is the value of x

, length, and width?
Mathematics
1 answer:
Mumz [18]4 years ago
6 0
P=w+l
42=(3x+7)+(2x-1)
42=5x+6
36=5x
x=36/5

plug in x

w=3(36/5)+7
w=28.6

l=2(36/5)-1
l=13.4
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The graph below represents the number of pieces of paper that are found in boxes. What is the constant of proportionality?
kotegsom [21]

Answer:

12.5

Step-by-step explanation:

It is equal to the slope of the line = 50/4 = 12.5

5 0
2 years ago
Aaron’s age is three years less than Devon‘s age the sum of their ages is 31 find each of their ages
Goryan [66]
  • Answer:

<em>Aaron 14 years</em>

<em>Devon 17 years</em>

  • Step-by-step explanation:

<em>D = A + 3</em>

<em>D + A = 31</em>

<em>replace D</em>

<em>A + 3 + A = 31</em>

<em>2A = 31 - 3</em>

<em>2A = 28</em>

<em>A = 14 years</em>

<em>D = 17 years</em>

6 0
3 years ago
The price of a cup of coffee was $2.45 yesterday. Today, the price rose to $2.80. Find the percentage increase. Round your answe
Fed [463]
We have that
2.45----------------- > 100%
2.80------------------X
x=2.80*100/2.45=114.29
114.29-100=14.29%-- >14%

the answer is 14%
5 0
4 years ago
Read 2 more answers
What value of x is in the solution set of 9(2x + 1) &lt; 9x - 18? <br> -4<br> -3<br> -2<br> -1
Anastaziya [24]

Answer:

The only possible answer that is correct is the first one, x = -4.

Step-by-step explanation:

Simplify the given inequality as much as possible, and then substitute each of the given x values one by one to determine which is in the solution set.

9(2x + 1) < 9x - 18 becomes 18x + 9 < 9x - 18, which, if reduced by dividing all four terms by 9, becomes 2x + 1 < x - 2.

Simplifying further, we get x < - 3.  The only possible answer that is correct is the first one, x = -4.  -4 < -3 is true.

8 0
3 years ago
Read 2 more answers
5 more than the product of 9 and 3
dolphi86 [110]
(9)(3) + 5

27 + 5

32



Your answer is 32.
7 0
3 years ago
Read 2 more answers
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