Keegan says that a quadrilateral is a square if and only if it is a rectangle. is this a true biconditional statement?

If 50% of a number is 14 then 100% of the number is

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?