Identify the variation as direct, inverse, joint or combined. V = r²h

direct
inverse
joint
combined

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Ineed with number 6 , explain how to get 1978

If g^-1(x) is the inverse of g (x) which statement must be true