Question

A parallelogram has a base that measures 5 units and a height that measures (x + 6) units. The area of this parallelogram is 20 square units. What must be the value of x?
Choose one answer.
a. x=4
b. x=-2
c. x=5
d. x=15

Answer 1

The answer is

The answer is b. x=-2 

The area (A) of a parallelogram with height h and base b is:
A = b*h

We have:
b = 5
h = x + 6

A = 20
A = b * h
5 * (x + 6) = 20
x + 6 = 20 / 5
x + 6 = 4
x = 4 - 6
x = -2