Posted by Anonymous on Saturday, October 8, 2011 at 8:37pm.
Find the length of one base of a trapezoid if the area is 126 inches squared, the height is 7 inches and the length of the other base is 15 inches.

algebra  Steve, Sunday, October 9, 2011 at 6:32am
Just plug in what you know:
If the two bases are a and b, and the height is h,
area = h(a+b)/2
126 = 7(a+15)/2
I trust you can figure out a's value from here.