单项选择题

On the number line above，what number correspnds to a point that is of the distance from 10 to 40（）

A. 6
B. 8
C. 12
D. 15
E. 22

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单项选择题

What is the cost，in cents，of using a certain fax machine to send n pages of a report if the total cost for sending the first k pages is r cents and the cost for sending each additional page is s cents(Assume that n＞k．)（）

A. r+s(n-k)
B. r+s(n+k)
C. rs(n+k)
D. kr+s(n-k)
E. kr+ns

单项选择题

Among the 900 spectators at a football game，there was a total of x students from College C and a total of y students who were not from College C（）．

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D.if the relationship cannot be determined from the information given.