Im to write a function,that showsthe total cost of b(x) to rent a car driven (x)miles

b(x) = f + rx

To calculate the total cost of renting a car based on the number of miles driven, you need two pieces of information: the rental cost per mile and the number of miles driven.

First, write a function called `rental_cost` that takes two parameters: `cost_per_mile` and `miles_driven`. This function will calculate the total cost of renting a car.

Here's an example implementation in Python:

```python
def rental_cost(cost_per_mile, miles_driven):
total_cost = cost_per_mile * miles_driven
return total_cost
```

In this function, we multiply the `cost_per_mile` by the `miles_driven` to get the total cost. The `total_cost` variable holds the result, which is then returned by the function.

To use this function, you can call it with your desired values for `cost_per_mile` and `miles_driven`. For example:

```python
rental_cost = rental_cost(0.5, 100)
print(rental_cost)
```

In this example, a car is rented for $0.5 per mile, and it has been driven 100 miles. The function call will output `50.0`, which is the total cost.

Remember to adjust the function and values according to your specific requirements and programming language.