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Janelle is planning to rent a car while on vacation. The equation C= 0.38m + 25 models the relation between the cost in dollars, C, per day and the number of miles, m, she drives in one day.
(a) Find the cost, in dollars, if Janelle drives the car 0 miles one day.
$
(b) Find the cost, in dollars, on a day when Janelle drives the car 400 miles.

Answer 1

To find the cost, in dollars, when Janelle drives the car 0 miles in one day, substitute 0 for m in the equation. For a day when she drives the car 400 miles, substitute 400 for m.

Step-by-step explanation:

To find the cost, in dollars, if Janelle drives the car 0 miles in one day, we substitute 0 for m in the equation. This gives us:

C = 0.38(0) + 25

C = 0 + 25

C = 25 dollars

To find the cost, in dollars, on a day when Janelle drives the car 400 miles, we substitute 400 for m in the equation. This gives us:

C = 0.38(400) + 25

C = 152 + 25

C = 177 dollars

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