Give the meaning of the equations

Question

If f(p)=q means that, at a price of p dollars, a sandwich shop can sell q thousands sandwiches per week, then give the meaning of the equations f(4.5) = 1.2 and f'(4.5) = -0.1

Answer 1

f(4.5) = 1.2     means that 1200 sandwiches are sold per week at a price of $4.50

 

f'(4.5) = -0.1    means that the sandwich shop decreases sales at an average rate of 100 sandwiches per week for $4.50