Find the exponential function that contains the points (2,10) and (3,5)

Witch represents the inverse of the function f(x)=1/4x-12

Wrote and expression for the difference of p and 4

What is the missing statement in step 4? ? rts ? ? vtu and ? rtu ? ? vts ? rts ? ? rvs and ? rtu ? ? stv ? vrs ? ? vru and ? usr ? ? usv ? vur ? ? vus and ? uvs ? ? sru