Write an equation of the line passing through the points (3,1) and (−1, −7). Sorry I'm just lazy and forgot how to do this

Thanks :)

Which statement best describes the polynomial

Twelve less than a number is at most 20

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.