Please help, I do not fully understand how to do these.

Question 1:

Find the function fog and its domain if /(x ) = *-1 and g(x) = XThe flash unit on a camera operates by storing charge on a capacitor and releasing it suddenly when the flash is set off. The data in the table describe the charge O remaining on the capacitor at time / (measured in seconds after the flash goes off). Use the data to estimate the electric current flowing from the capacitor to the flash bulb when 1 =0.04. Note: The slope of the tangent line represents the electric current flowing from the capacitor to the flash bulb (measured in microamperes). t (seconds) 0.00 0.02 0.04 0.06 0.08 0.10 O (microcoulombs) 80.00 61.50 51.08 41.80 36.45 28