Which one, Its multi-question.

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

The amount of energy it takes to lift a box might be a function of which of the following

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)