A set of weights includes a`20`lb barbell and`6`pairs of weight plates. Each pair of plates weighs `30` lb. If x pairs of plates are added to the barbell, the total weight of the barbell and plates in pounds can be represented by `f(x)=30x+20.`
1 answer
Since each pair of plates weighs `30` lb, if `x` pairs of plates are added to the barbell, the weight of the plates will be `30x` lb. Hence, the expression `f(x) = 30x + 20` represents the total weight of the barbell and plates in pounds.