What is the sign of -5{-1/2}

Find the complete factored form of the polynomial 40m^3n^2+45m^2n^6

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.

Find two numbers if their sum is 91 and the ratio is 6: 7?