EASY AND POINTS!! PLEASE HELP

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

When is g(x) = 0 for the function g(x) = 5.23x + 4?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)