Final answer:
The cost of renting a car for one day and driving 200 miles is $58. The total rental expense when the car is rented for one day can be expressed as $18 + ($0.20 * x), where x is the miles driven.
Step-by-step explanation:
To calculate the cost of renting the car for one day and driving 200 miles, we need to calculate the rental cost and the mileage cost separately.
For one day, the rental cost is $18.
The mileage cost for driving 200 miles is $0.20 per mile, so the cost would be 200 miles * $0.20 = $40.
Therefore, the total cost of renting the car for one day and driving 200 miles would be $18 (rental cost) + $40 (mileage cost) = $58.
To express the total rental expense as a function of the miles driven (x) when the car is rented for one day, we can use the formula:
Total rental expense = Rental cost + (Mileage cost per mile * Miles driven)
In this case, the rental cost is $18 and the mileage cost per mile is $0.20. So the function would be:
Total rental expense = $18 + ($0.20 * x)