Which set of ordered pairs is a function? {(2, 1), (2, 2), (2,3), (2, 4), (2,5)}
{(0,0), (1,1), (1, -1), (4,2), (4,-2)}
{(1, 1), (2, 2), (3, 3), (4,4), (5,5)}
{(1,5), (2, 4), (3, 3), (2, 2), (1,1)}

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

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

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).