Let c ∈ (a, b) and let d ∈ r. define f : [a, b] → r as ( d if x = c, f (x) : = 0 if x = c. prove that f ∈ r[a, b] and compute r b a f using the definition of the integral (but feel free to use the propositions of this section).

i don't see any steps below, sweetheart

all you should have to do is insert 1 where the c is, representing that one car is sold.

f(c) = 250c + 500

f(1) = 250(1) + 500

f(1) = 250 + 500

f(1) = 750

he earns $750 for each car sold.

hope this you! have a happy , here's a turkey!