How to draw a model to show that 1+4 is the same as 4+1?

What is the volume of this square pyramid?

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2