Please help me!!! extra points

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.

If you divide a speed in miles per minute by 60, you get the same speed expressed in miles