What is the exact area of a circle with a diameter of 12 feet 36π square feet 81π square feet 324π square feet 1296π square feet

For the following sequence determine the common difference (if it is an arithmetic sequence) or the common ratio (if it is a geometric sequence).

If 20% of a number is 35, what is 50% of that number?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).