Can someone me with the last 3 questions

Can (3,5 and square root 34) be sides on a right triangle?

The difference between tax advoidance and tax evasion

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.