It says to solve each proportion which i forgot how to do. .

9 over 15 = x over 10

c over 14 = 6 over 21

0.2 over 1.5 = 2 over d

2x over 6 = 4x+8 over 15

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