Solve this: if [a]=2,then 1[a]0=120 feet, and if [c]=8, then 6[c]=68 feet

Charles is on a 8 1/2 mile bike ride. he stops for a rest after he’s gone 5 2/5 miles. how much farther does he still have to go?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Which of these tables represents a non-linear function?