Chapter 1, Problem 121RE

(a)

To determine

The function that represents the distance, $d\left(t\right)\left(\text{in}\text{miles}\right)$ , travelled by the car in a time of $t\text{hours}$ , given that a car is traveling at a speed of $60\text{mph}$ on the highway and gets $28\text{mpg}$ of gasoline.

(b)

To determine

The function that represents the number of gallons of gasoline, $n\left(d\right)$ , used by the car to travel a distance of $d\text{miles}$ , given that a car is traveling at a speed of $60\text{mph}$ on the highway and gets $28\text{mpg}$ of gasoline.

(c)

To determine

To calculate: The value of the given function, $\left(n\circ d\right)\left(t\right)$ , and the interpretation of its meaning in the context of this problem.

(d)

To determine

To calculate: The value of the given function, $\left(n\circ d\right)\left(7\right)$ , and the interpretation of its meaning in the context of this problem.