If cos(x) = 3/5 and sin x < 0, find sin(2x) as a fraction in simplest terms

The circumference of a circle is 60 pi cm3what is the radius of the circle

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x