posted by Alexis .
ABCD is a parallelogram. If angle B is equal to 2x and angle A is equal to x + 30, find x.
The opposite angles of a parallogram are equal. The sum of the angles = 360
B = D = 2x,
A = C = x + 30.
2*2x + 2(x + 30) = 360. Solve for x.