Plz help me solve this

Arectangular prism is 3 meters long, 6 meters wide, and has a height of 9 meters. what is its surface area?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0