单项选择题

Two buses are 515 miles apart. At 9:30 a. m., they start traveling toward each other at rates of 48 and 55 miles per hour. At what time will they pass each other（）

A、1:30 p.m
B、2:00 p.m
C、2:30 p.m
D、3:00 p.m
E、3:30 p. m

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多项选择题
Which of the following is an equation of a line that is perpendicular to the line whose equation is 2x+3y=4 Indicate all such equations.（）

A. 3x+2y=4
B. 3x-2y=4
C. 2x-3y=4
D. 4-3x=-2y
E. 4+2x=3y
单项选择题
When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students（）

A. 6.5
B. 6.75
C. 7.0
D. 7.25
E. 7.5
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