Can somebody please help me!

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

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