What is the positive square root of 100

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Match each function with its rate of growth or decay

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?