Here is a right pyramid with a rectangular base: What is the one shape of cross-section we could create by slicing the pyramid parallel to its base

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

What does x = in this equation x+3+2x=x+5

Just tell me how to set up the equation.