Need help on a question for my math test, any ideas?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

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.