What multiplies to -18 and adds to 3

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?

Prove that 16^4-2^13-4^5 is divisible by 11.

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.