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13. The length of a rectangle is 9 cm more than 2 times the width. If the perimeter of the rectangle is 60 cm,
what are its dimensions?
a. length = 7 cm; width = 23 cm
b. length = 5 cm; width = 16 cm
C. length = 23 cm; width = 7 cm
d. length = 23 cm; width = 16cm

Respuesta :

mhanifa

Answer:

  • C. length = 23 cm; width = 7 cm

Step-by-step explanation:

Let the width is x, then the length is:

  • l = 2x + 9

Perimeter is:

  • P = 2(l + w)
  • 60 = 2(x + 2x + 9)
  • 30 = 3x + 9
  • 3x = 21
  • x = 7

Dimensions are:

  • Width = 7 cm, length = 2*7 + 9 = 23 cm

Correct choice is C

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