The following system of equations is y = -x + 2x + 6y = 4

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.

When turned about its axis of rotation, which shape could have created this three-dimensional object?

How many ordered pairs of positive integers satisfy xy=32?