Can someone explain to me how to do this and what the answer is

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

The blue whale is the largest animal living on the earth. the average blue whale measures 100 feet long (30 meters) and weighs 300,000 pounds (136,000 kilograms). a whale’s head is 1⁄3 of the length of its body. a new baby whale is 1⁄4 the length of a grown whale. the average man is 1⁄17 the length of a blue whale, and 1⁄1,818 its weight. a human baby measures 1⁄4 of the length of an adult. calculate the following information: how long is a whale’s head? how long is a new baby whale? how tall is the average man? how much does the average man weigh? how tall is the average human baby?

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?