Barbara’s hourly salary is $6.75. Last week she worked a 30-hour week. She then spent 15 of her entire earnings. How much does she have left?

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