How many number between 1 and 100 (inclusive) are divisible by 4 or 5

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

Find the solution(s) to x^2-14+49=0

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?