SOMEONE PLS HELP THIS IS DUE SOON

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.