Samaad had $20.he spent $12.50.his mum gave him $10 more. samaad spent additional $14.50.how much is left?

Ineed to learn how to solve this problem

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

Which term applies to agb and dge? a. obtuse b. supplementary c. complementary d. vertical