Well really it would have to depend on the flashlight. Is it an led bulb or a regular bulb?
A. 7.1 b.idk sorry c.74,160
Answer:

Step-by-step explanation:
Given

Required
Determine the solution
Since b is a perfect square, the equation can be expressed as:

Apply difference of two squares:

Split:

Remove brackets:

Make a the subject in both equations

The solution can be represented as:

There are 4 terms in the expression