Will f(x)=-(x-9)^3(x-6)go from negative to positive at x=21 or keep the same sign

Select a graph that have an equation with a < 0

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?