Explain why you rename 4 1/4 to find 4 1/4- 3/4​

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.

With this question! what is process of elimination? ? p.s. my brothers acc got banned so add his new one @ yamauchiyamyam17

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap