皮皮学，免费搜题
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【单选题】
Suppose that a young couple has just had their first baby and they wish to ensure that enough money will be available to pay for their child's college education. Currently, college tuition, books, fees, and other costs, average $12,500 per year. On average, tuition and other costs have historically increased at a rate of 4% per year. Assuming that costs continue to increase an average of 4% per year, tuition and other costs for one year for this student in 18 years when she enters college will be closest to:A.
$12,500
B.
$21,500
C.
$320,568
D.
$25,323
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皮皮学刷刷变学霸
举一反三
【简答题】课下作业:3.3-3.10 课下作业:3.3-3.10
【简答题】在□里填上适当的数。 6.29+4.87+3.71=6.29+□+□ 8.11-0.73+1.89-2.27=8.11+□-（□+□）
【判断题】变压器在电力系统中主要作用是更换电压，以利于功率的传输。电压经升压变压器升压后，可以减少线路损耗，提高送电经济性，达到远距离送电的目的，而降压则能满足各级使用电压的用户需要。
A.
正确
B.
错误