Troy must keep track of the amount of refrigerant he uses from a​ 50-pound cylinder to ensure that accurate records are kept. He used 13 pounds on a system for Ms. Jones and 9 pounds on a system for a commercial client. How many pounds should he have left in the​ cylinder?

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Step-by-step explanation:

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let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.