What is 3/8 x 16/7? i don't know. it is for my math homework?

Asphere has a diameter of 10 in. what is the volume of the sphere?

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?