Please help me please

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

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0