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Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $Which of the following expressions gives the t
Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $Which of the following expressions gives the t
admin
2013-02-19
40
问题
Tina goes to the store to purchase some CDs and DVDs. CDs cost $15 and DVDs cost $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?
选项
A、15 + D
B、30 + 18D
C、18 +D+ 30
D、D(18 + 15)
答案
30 + 18D
解析
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 cost $18. Therefore, her cost for the DVDs was 18D. Now simply add the terms together to get 30 + 18D.
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