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22 August, 09:07

Write as an equation: The sides of a triangle are 7, x and (x + 1). The perimeter is 30.

A. 30 = 7 + (x+1)

B. 30 - 7 = 2x

C. 30 = 7 + 2 (x + 1)

D. 30 = 8+2x

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Answers (2)
  1. 22 August, 09:10
    0
    D

    Step-by-step explanation:

    Perimeter = addition of all sides

    30 = 7 + x + x + 1

    30 = 8 + 2x

    Collecting like terms

    30 - 8 = 2x

    22 = 2x

    Dividing by 2

    22/2 = 2x/2

    11 = x
  2. 22 August, 09:19
    0
    d

    This is because 7+x+1=30 (this is the equation btw).

    You combine the like terms so you get 30=8+2x (7+1 and x+x)

    do the equation so you get:

    30=8+2x

    -8 - 8

    22=2x

    divide both sides by 2

    11=x
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