How i do circumference and area

Anyone know? is appreciated! will mark brainliest if correct!

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

Divide. write in the simplest form. 4 1/6 divided by 10