Work out the area of a semicircle. Take pi to be 3.142 and give your answer to two decimal places. Radius-10cm

Abaseball team drinks 10/4 gallons of water during a game. which mixed number represents the gallons of water consumed? a) 1 1/2 gallons b) 2 1/2 gallons c) 2 3/4 gallons d) 3 1/2 gallons