Given rhombus ABCD with diagonal BD. If measure of angle C = 100°, what is the
measure of DBC?

Can someone me with my hwplz(only the circled ones)

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.

Need on this geometry question. explain how you did it.