The sum of 5 and 8 times a number is 45 which of the following equations below can be used to find the unknown number a.) 5+8x = 45 b.) 5*8x = 45 c.) 8x = 45 d.) 5x + 8 = 45

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.