What is 4/7 x 21/40 as a fraction?

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.

Hi, can anyone show me how to do this problem? 100 points for this. in advance

If a line is defined by the equation y = 5x + 2, what is the slope?