18 Andy has $310 in his account. Each week, w, he withdraws $30 for his expenses. Which expression could be used if he wanted to find out how much money he had left after 8 weeks?
(1) 310 - 8w
(2) 280 + 30(w - 1)
(3) 310w - 30
(4) 280 - 30(w - 1)
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