Answer:
Option C is correct.
Explanation:
The equation given is y = 0.5x +5
where x is the number of miles and y is the total cost.
We need to find total cost y if the car has traveled 30 miles
so, x=30
Putting value of x in the given equation:
y = 0.5x +5
y = 0.5(30) + 5
y = 15 + 5
y = 20
So, the total cost is $20
Option C is correct.