PLEASE HELP ME I"M DYING HERE

Use circumcenter theorem to solve for the given values

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)