Need help with all of it, please!! Thank you.

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.

Anyone know these questions? i need ,.

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?