Mathematics B Regents High School Examination Worksheet - The University Of The State Of New York, 2004 Page 6
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15 If f(x) = x
– 2x
, then f(i) is equivalent to
Use this space for
computations.
(1) –2 + i
(3) 2 + i
(2) –2 – i
(4) 2 – i
16 Which statement must be true if a parabola represented by the
2
equation y = ax
+ bx + c does not intersect the x-axis?
2
(1) b
– 4ac = 0
– 4ac < 0
2
(2) b
– 4ac > 0, and b
2
2
(3) b
– 4ac is a perfect square.
– 4ac > 0, and b
2
2
(4) b
– 4ac is not a perfect square.
17 A garden in the shape of an equilateral triangle has sides whose lengths
are 10 meters. What is the area of the garden?
2
2
(1) 25 m
(3) 50 m
2
2
(2) 25
3
m
(4) 50
3
m
12
18 If x is an acute angle and sin x =
, then cos 2x equals
13
25
– 25
(1)
(3)
169
169
119
– 119
(2)
(4)
169
169
[6]
Math. B – Jan. ’04
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