Janelle is planning to rent a car while on vacation. The equation C=0.32m + 15 models the relation between the cost in dollars, C, per day and the number of miles, m, she drives in one day. Find the cost on a day when Janelle drives the car 400 miles.

cost when 400 miles is driven is $143.

Step-by-step explanation:

Model for cost calculation: C=0.32m + 15

We have to find cost when no. of miles driven is 400.

To find that cost we need to plug 400 in place of m.

C=0.32m + 15

=> c = 0.32*400 + 15

=> c = 128 + 15 = 143

Thus, cost when 400 miles is driven is $143.