Find the perimeter of a square with a side length of 4x

Ineed with number 17 i don’t get it at alll

The table shows the distance traveled over time while traveling at a constant speed.

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