Gloria has a lunch account in the school cafeteria. the balance, f(x), in her account can be represented by the function f(x) = –1.50x + 40, where x is the number of meals purchased. suppose –1.50 changed to –2.75. what does this mean in the context of the problem?

a. changing –1.50 to –2.75 means her initial balance has decreased.
b. changing –1.50 to –2.75 means her initial balance has increased.
c. changing –1.50 to –2.75 means the price per meal has decreased.
d. changing –1.50 to –2.75 means the price per meal has increased.