Answer:
20 cm
Step-by-step explanation:
Assuming that the side lengths you've written are the only side lengths of the shape, meaning it would be a trapezoid, all you do is add them up together.
3 + 5 + 5 + 7 = 20
oop lol
I think it's C im not certain
x = 3
-4x-5+2x = -11
(-4x+2x)-5 = -11
-2x-5 = -11
-2x-5+5 = -11+5
-2x/-2 = -6/-2
305
61 x 5 = 305