Eight cups of water filled the pitcher to 4/6 capacity. How many cups will the pitcher hold?

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

Can someone me with this problem i don't understand i need

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)