Source:New SAT Study GuideSAT Study Guide Explanations, Test 2; Test 2, Section 4; #35

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According to the model, how many dollars was Jane's initial deposit?

a = 18t + 15

Jane made an initial deposit to a savings account. Each week thereafter she deposited a fixed amount to the account. The equation above models the amount a, in dollars, that Jane has deposited after t weekly deposits. According to the model, how many dollars was Jane's initial deposit?