Question

ABc bookstore sells magazines according to the demand function p= -Q + 42, where p is the price

Answer 1

P = -Q + 2518 = -Q + 2518-25 = -Q-7 = -Q-7/-1 = -Q/-1Q = 7

Therefore, the store can expect to sell 7 new books if they will charge $18 for the new books.