Question

Andre received $60 for his birthday that he put in his piggy bank. Each week, he puts 3 more dollars in his bank so that the amount of money in dollars D in his bank is given by D = 3w + 60 where w is the number of weeks. His sister Lana makes a table of reasonable values for w to determine how much money Andre will eventually have. If one of the values for w Lana selects is 12, what would be her corresponding entry for D?

Answer 1

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so given the equation D = 3w + 60
plug in when w = 12
so D = 3(12) + 60 (<-- simplify)