~will mark brainiest~ {(4,-5), (0,-9), (1,0), (7,0)} determine whether each realation is a function. explain ! : )

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.

Which of the following is true for the relation f(x)=2x^2+1

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.