Math problem

Question

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.

Answer 1

x = number of meals purchased

-1.50x = the cost of meals, therefore the cost of one meal is $1.50

If it changes it means that the cost of one meal has increased to $2.75.

 

D.