Complete Question:
Suppose a local vendor charges $2 per hot dog and that the number of hot dogs sold per hour is given by
, where is the number of hours since 10 AM:
a) Find an expression for the revenue per hour as a function of x, R(x)
b) Find and simplify, R(x(t))
Answer:
a) R(x) = 2x
b)

Explanation:
a) This is a very trivial exercise.

The number of hot dogs sold per hour is given by x
Charge per hot dog = $2
An expression of revenue per hour,R, as a function of the number of hot dogs sold per hour, x, is therefore: R(x) = 2x
b)

R(x(t)) = 2(x(t))
