Answer:
The correct answer is P = 24 + 8x.
Explanation:
First, we must express the length and width of the frame.
Length = 7 + 2x
Width = 5 + 2x
The perimeter is the sum of the four sides of the frame.
P = 2 * (7 + 2x) + 2 * (5 + 2x)
P = 14 + 4x + 10 + 4x
P = 24 + 8x
In this way, we express the perimeter (P) of the frame.
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