单项选择题

What is the area of a circle whose radius is the diagonal of a square whose area is 4

(A) 2π
(B) 2π

(C) 4π
(D) 8π
(E) 16π

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单项选择题

Camille’s average on her 6 math tests this marking period is 75. Fortunately for Camille, her teacher drops each student’s lowest grade, and this raises her average to 85. What was her lowest grade

A．20
B．25
C．30
D．40
E． 50

单项选择题

If m2=17, then what is the value of (m+1)(m-1)

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