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What is the first step of an indirect proof of a number that is divisible by two

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

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.