What is the answer? this is a multiple choice. So which measurement is less than 5 ft?

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.

If f(x)= 3x+6 which of the following is the inverse of f(x)

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?