The correct answer I would think would be C but I would try A because B does no have a proportion of 3/4.
The missing height is 5 inches.
The height parallel to the missing height is 15, subtract 10 to find 5.
A square has 4 equall side so if one side is 2x+3
then:
the perimeter is 2x+3 + 2x+3 + 2x+3 + 2x+3
Combine like terms and the answer is:
8x+12
