Hiii need help I'm in exam​

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

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?

Which is greater or equal 312 mg or 312 dg