I need help with my homework it is geometry and I don’t understand idk what to do with it can you help me out and I been struggling and crying I try my best and I still can’t I give up and please help me this is due today

Find percent notation for 0.008 0.008=

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

Extra points! find the missing dimension! need asap