From the adjoining figure, find the value of x

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

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Me find the value of x each figure.