What is the answer? to this question

The verbal translation for the difference of m and 7 increased by 15

The bolo cavern outside of vandalia is 421 ft below sea level. a little more than75 miles away. mt owens is 7295 feet above sea level. what is the difference in elevation between the bolo cavern and mt owens?

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