Solve for a.

4(a+2)=8+4a

1. no solution

2. −1

3. all real numbers

4. −2

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