Which algebraic expression has like terms?
9 n cubed minus 2 n + 3 minus 4 n squared
7 n cubed + 3 n minus 3 minus 6 n squared
7 n cubed + 4 n minus 3 n cubed minus 5 n squared
6 n cubed minus 4 n Superscript 4 Baseline + 6 n minus 5 n squared

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