joejoe9 joejoe9

25-07-2016
Mathematics

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The perimeter of a rectangle is 42 inches.if the width of the rectangle is 6 inches,what is the lenght

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dalendrk dalendrk

25-07-2016

The perimeter of rectangle: P = 2a + 2b

P = 42 in; a = 6 in; b = ?

subtitute

2 · 6 + 2b = 42
12 + 2b = 42 |subtract 12 from both sides
2b = 30 |divide both sides by 2

b = 15 (in)

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