need the x and y intercepts, intervals increasing and decreasing, positive and negative, max and minimums, domain and range

What statement is true? 2x^2-9x+2=-1

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 statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?