Which equation can be used to model this situation?

Which best explains why this triangle is or is not a right triangle?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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.