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Sunny_sXe [5.5K]
3 years ago
15

the perimeter of a rectangle is 56 m. if the width were doubled and the length were increased by 8 m, then the perimeter would b

e 82 m. what are the dimensions
Mathematics
1 answer:
Natasha2012 [34]3 years ago
3 0
----------------------------------------------------------------
Define x and y:
----------------------------------------------------------------
Let the length be x.
Let the width be y.

----------------------------------------------------------------
Formula:
----------------------------------------------------------------
Perimeter = 2(Length + Width)

----------------------------------------------------------------
Construct equations and solve for x and y:
----------------------------------------------------------------
2x + 2y = 56            ---------------------- (1)
2(x+8) + 4y = 82     -----------------------(2)

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From equation 1:
----------------------------------------------------------------
2x + 2y = 56
x + y = 28
x = 28 - y

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From equation 2:
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2(x+8) + 4y = 82 
2x + 16 + 4y = 82
2x + 4y = 66
x + 2y = 33

----------------------------------------------------------------
Substitute x = 28 - y into equation 2:
----------------------------------------------------------------
x + 2y = 33
(28 - y) + 2y = 33
28 - y + 2y = 33
y = 5

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Substitute y = 5 into equation 1:
----------------------------------------------------------------
x = 28 - y 
x = 28 - 5
x = 23

----------------------------------------------------------------
Find Length and Width
----------------------------------------------------------------
Length = x = 23 m
Width = y = 5m

----------------------------------------------------------------
Answer: Length = 23m and Width = 5m
----------------------------------------------------------------
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a) 75 percent of the regular price is the price for senior citizens.

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<u>Step-by-step explanation</u>:

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  • The offer price for senior citizen = 15% discount from 100%

∴ Percent of the regular price for senior citizens = 100% - 15% = 75%

The price for the senior citizens = 75% of $8.95

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⇒ 0.75\times8.95

⇒ 6.712 dollars.

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