What is the mass of
30,000 molecules?
Mass of one molecule of
oxygen 5.3 x 10-23 gram

What percent of the circle below is shaded?

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

Can someone show me step by step how to do this?