What does this symbol tell you to do (:) ?

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.

If there are 3.281 feet in 1 meter, how many inches are in one centimeter

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