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Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

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.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.