What is 15% of 75 and how do you get the answer?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges