Set up the the equation that can be used to solve the following "eight less than the square of a number is the same as adding the number and four." use x to represent the unknown number
a.8-x2=x+4
b. x2-8=x+4
c. 2x-8=x+4
d. 8-2x=x+4

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.