2. 外语
  3. Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $18. Which of the following expressions gives t

Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $18. Which of the following expressions gives t

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问题 Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $18. Which of the following expressions gives the total amount of money, in dollars, Tina will pay for purchasing 2 of the CDs and D of the DVDs?
   ______15+D
   ______30+18D
   ______18+D+30
   ______D(18+15)
选项
答案 The first step is to calculate the total cost of the CDs: 2(15)=30. You are given that, in addition to the 2 CDs, Tina also purchases D of the DVDs, each of which costs $18. Therefore, her cost for the DVDs was 18D. Now simply add the terms together to get 30+18D.
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