-2 1/2 divided by 3 1/2 ?

3(10x-y)-5(x-y^2) need this solved asap

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.

What is the best estimate of the length of a football