Question 821024
Add up the sides and set them equal to the perimeter. Then solve for x.


S1 + S2 + S3 = P


2x + (x+7) + 3(x-1) = 52


2x+x+7+3x-3 = 52


6x+4 = 52


6x = 52-4


6x = 48


x = (48)/(6)


x = <font color="red">8</font>