Which relation is not a function? a
b
{(1,3), (2,4), (3,5), (4,6)
(6,3). (4,7).(-6,3), (4,-1)}
{(8,9), (7,9), (3,9),(4,9)}
{(5,2), (3,7), (-2,4),(0,7)}
С
HELP PLAS

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.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Which of these tools or constructions is used to inscribe a hexagon inside a circle?