Which expression could be used to determine the perimeter of the triangle? A 9x + 4
B 9(x + 4)
C 13x
D 13(x + 1)

A. 9x + 4

Step-by-step explanation:

Perimeter of a triangle = side A + side B + side C

Side A = 2.5x + 3

Side B = x + 6

Side C = 5.5x - 5

Perimeter of a triangle = side A + side B + side C

= (2.5x + 3) + (x + 6) + (5.5x - 5)

= 2.5x + 3 + x + 6 + 5.5x - 5

= 2.5x + x + 5.5x + 3 + 6 - 5

= 9x + 4

Perimeter of a triangle = 9x + 4

The correct answer is A. 9x + 4

step-by-step explanation:

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