Help me with this plz

How long would it take for a ball dropped from the top of a 576-foot building to hit the ground? round your answer to two decimal places.

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way