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

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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

单项选择题

A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, what is the value of x（）

A. 400
B. 3,200
C. 3,700
D. 4,400
E. 4,760

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