Help asap, please :)

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

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok