Which expression is equivalent to (2 ½× 2 ¾)²

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Divide. write in the simplest form. 4 1/6 divided by 10