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18-10-2018
Mathematics

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The length of a rectangle is 9 cm more then half the width. Find the length of the perimeter is 60cm

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wegnerkolmp2741o wegnerkolmp2741o

18-10-2018

length = 1/2 w+9

perimeter= 60 =2(l+w)

substitute in for length

60 = 2(1/2 w +9 +w)

60 = 2 (3/2 w +9)

distribute

60 = 3w + 18

subtract 18 from each side

42 = 3w

divide by 3 on each side

14 = w

length = 1/2 w + 9

length = 1/2 (14) +9

7 + 9

16cm

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