Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $18. Whic

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)

请帮忙给出正确答案和分析,谢谢!

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  • 提问人:00****83
  • 发布时间:2018-08-21

2018-08-21 13:54   

正确答案: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.
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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