Sorry for it being so long

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 ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.