What should be added to -7/20 to get -2/5

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Which of the following expressions is equal to 2x^2+8

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