On a clear day, the approximate distance, d, in feet that a sightseer standing at the top of a building h feet tall can see is given by the function: d=6397.2 (square root of H)

A) On a clear day, what distance in feet can a sightseer from the top of a 900-foot building ? Give your answer to the nearest foot.

B) How tall is a building from which a sightseer can see a distance 32 miles on a clear day ? Give your answer to the nearest foot** (Note: 1 mile equals 5280 feet)