Can someone help me on number 13 and if you can 14 as well

Volume of a cylinder with a radius of 13 in and height of 30 in

Estimate the product. round the first factor to the nearest whole number, round the second factor to the nearest ten, and then multiply. 3 8/9 × 96

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?