What is the formula of solid hemisphere and ehat is the formula of its surface area???

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Oliver read for 450 minutes this month his goal was to read for 10% more minutes next month if all of her medicine go how many minutes will you read all during the next two months