Use substitution to solve the system of equations. y = 4x 2x − y = −8 a. (4, 1) b. (4, 16) c. (2, −8) d. (−8, −2)

If 25% of y is 30, what is 60% of y?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.

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?