Final answer:
The rental cost will be the same at both shops for any number of hours.
Step-by-step explanation:
To find the number of hours at which the rental cost at both shops will be the same, we need to set up an equation. Let's assume the rental cost at shop A is $x per hour and at shop B is $y per hour. We can write the equation as:
x * h = y * h
where h is the number of hours. Since the rental cost is the same, we can cancel out the h on both sides of the equation, resulting in:
x = y
So, the rental cost will be the same at both shops for any number of hours (a, b, c, and d are all correct answers).