Given sinx=1/3, cosy=3/4, and both x and y are in quadrant iv, find cos(x-y) and sin(x+y)

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.

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

What is the midpoint of np if n (1,9) and p (-5-1)