Given:
• Length of bases of the trapezoid:
a = 6 in
b = 12 in
• Area of trapezoid = 63 in²
Let's find the height of the trapezoid.
To find the height of the trapezoid, apply the formula for the area of a trapezoid:

Where:
A is the area
a and b are the bases
h is the height.
Rewrite the formula for h:

Now, plug in the values and solve for the height, h:

Therefore, the height of the trapezoid is 7 inches.
ANSWER:
b. 7 in