Problems 7-12 Simplify each expression,
7.
(4+ 5)²
8.
(3t2 + 1)(2t– 9)
14.2 2(0)5 15
1602 +40 + 25
9.
-7y(2y3 - 3y - 9)
10.
(4x - 7) + (x + 3)2