Please help with statements and reasons?

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

The probability that a tutor will see 0, 1, 2, 3, or 4 students is given below determine the probability distribution's missing value.