Math homework will give brainliest all 3 pls

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.)

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.