Regents High School Examination - Mathematics B Worksheet - The University Of The State Of New York, 2009 Page 6
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24Use this space for
16 If the dilation D
is an isometry, what must be the value of k?
computations.
k
(3) −2
(1) 1
(2) 2
(4) 0
17 If f(x) = x
and g(x) = 2x + 1, which expression is equivalent to
2
?
(f g)( )
x
°
+ 1
+ 1
2
2
(1) 2x
(3) 4x
(2) 2(x + 1)
+ 4x + 1
2
2
(4) 4x
18 What is the inverse of the function y = 2x − 3?
+ 3
x
=
= −
+
(1)
y
(3)
y
2
x
3
2
x
1
=
=
+
(2)
y
3
(4)
y
−
2
2
x
3
0, which function represents the reflection of y = a
>
x
19 If a
in the
y-axis?
−
x
⎛
⎞
1
(1) y = −a
x
=
⎜
⎟
(3)
y
⎝
⎠
a
x
⎛
⎞
1
y
=
(4) x = a
⎜
⎟
(2)
y
⎝
⎠
a
− 3y
= 4 forms
2
2
20 The graph of the equation 2x
(1) a circle
(3) a hyperbola
(2) an ellipse
(4) a parabola
[6]
Math. B – Aug. ’09
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