Please help for question 2A and 2B I will mark brainlist

What is the size of the matrix resulting from

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.

Find the measure of angle b in the following triangle