Mathematics B Test - Regents High School Examination, The University Of The State Of New York Page 4

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Use this space for
y
x
computations.
13 Which expression is equivalent to
?
2
2
x
y
1
1
(1)
(3)
+
x
y
x
y
1
1
(2)
(4)
+
x
y
x
y
14 If log x = 3 log a − log b, then x is equal to
3a
(1)
(3)
3a
b
b
3
a
3
(2)
(4)
a
b
b
1
3
15 Which expression is equivalent to b in the equation V =
4
?
a b
2
6
V
V
(1)
(3)
4
12
a
a
5
V
V
(2)
(4)
2
7
a
a
16 In the binomial expansion of (x + y)
8
, what is the coefficient of the term
3
5
containing x
y
?
(1) 15
(3) 56
(2) 28
(4) 70
17 If R is inversely proportional to A, and R = 4 when A = 100, what is the
value of R when A = 250?
(1) 0.625
(3) 10
(2) 1.6
(4) 6,250
[4]
Math. B – Jan. ’10

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