The answer to this question

You can find the constant of proportionality by finding the ratio of

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.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.