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8 November, 12:46

The perimeter of a rectangle is 90 centimeters. The width of the rectangle can be represented by (x + 2), and its length can be represented by (3x - 5). What are the dimensions of this rectangle in centimeters?

A With = 10 and length = 25

B With = 12 and length = 29

C With = 14 and length = 31

D With = 16 and length = 32

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Answers (1)
  1. 8 November, 12:54
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    Perimeter of a rectangle=2lenght + 2width

    In this case:

    Perimeter=90 cm

    width = (x+2)

    lenght = (3x-5)

    Then:

    2 (x+2) + 2 (3x-5) = 90

    2x+4+6x-10=90

    2x+6x=90+10-4

    8x=96

    x=96/8

    x=12

    with = (x+2) = 12+2=14

    lenght = (3x-5) = 3*12-5=31

    Answer: C width=14 and lenght=31.
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