Aroller coaster begins at 90 feet above ground level. then it descends 105 feet find the height of the coaster after the first descent

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.

Which number produces an irrational number multiplied by 1/3

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation