Aparabola can be drawn given a focus of (0, 8)(0,8) and a directrix of y=-10y=−10. write the equation of the parabola in any 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?