Pleaseee help will give u a BRAINLESS... find the circumference and the area of this circle​

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Apool measures 12.3 feet by 16.6 feet. if the longer wall of the pool has a diagonal of 17.8 feet, what is the volume of the pool? (round to nearest tenth)

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?