Answer:
18x + 6
Step-by-step explanation:
In a rectangle, the opposite side lengths are congruent and have the same measurement. In solving the perimeter, add all sides together:
(4x + 7) + (4x + 7) + (5x - 4) + (5x - 4)
Combine like terms (terms with the same variable, as well as same amount of variable):
(4x + 4x + 5x + 5x) + (7 + 7 - 4 - 4)
(8x + 10x) + (14 - 8)
18x + 6
18x + 6 is your simplified expression that represents the perimeter of the rectangle.
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