Pls help me geometry is so confusing

If n stands for number sold and c stands for cost per item, in which column would you use the formula: ? a. column d c. column f b. column e d. column g

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.

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?