Answer 6,7 is it possible to make a triangle with the following lengths ?

Could someone with number 1 and 2

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.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83