If f(1) = 3 and f(n) = f (n - 1) - 3 then find the value of f (4)

Answer this question! 30 points and brainliest!

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 slope of the line that contains the points (-2,1) and (0,-3)