Smith can complete 68 oil changes in 4 days. how many oil changes can smith complete in 8 days

When only separate discreet points are graphed it is called?

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

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?