11. 2(9x + 15)- 2(8 + 2x) 12.(7x - 12) - 2(3x + 10) pls

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.