Question

Quadrilateral ABCD is a parallelogram. What is the length of AD?

AB = x + 15
AD = 2x + 18
BC = 3 - x
CD = 3x + 25

Answer 1

-5

Explanation:

ab = dc

x+15= 3x+25

2x = -10

x = -5

substituting in ad and bc

-10+18 = 8

3-(-5)=3+5=8