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19. The correct answer is (B). [+] Since the diameter and the height of the cylinder are equal:
So (B) is the best response.
20. The correct answer is (E). [0] Raise both sides of the equation to the fourth power:
(x
1/4
)
4
= 20
4
x = 20
4
= (2 
× 10)
4
= 2
4
× 10
4
= 16
× 10,000 = 160,000
21. The correct answer is (D). [–] This problem can be easily solved if you recall that two lines are
perpendicular just in case the product of their slopes is –1. Alternatively, you could sketch the graph
of each of the lines.

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Mathematics Level IC/IIC Subject Tests
241
ARCO
■ SAT II Subject Tests
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22. The correct answer is (B).  
stands for the summation of all the values of 2k – 1 for the
integers 1 through 3, inclusive:
= 9
23. The correct answer is (C).
[–] Event e either occurs or does not occur—that is certain. Thus, the prob-
ability of (e or not–e) is a certainty or 1. If we let y represent the probability that e does not occur, then:
24. The correct answer is (C). [0] For the first six tests, the student has accumulated a total point count
of 6 
× 83 = 498. If the student scores zero on each of the remaining four tests, the total point count will
remain 498 and the average will be 
498
10
= 49.8. If the student scores 100 on each of the four remain-
ing tests, the total point count will be 898 and the average will be 
898
10
= 89.8.
25. The correct answer is (E). [–] Let x be the multiplicative inverse of 2 – i: (x)(2 – i) = 1
And rationalize the right side of the equation:
Since 
, so:

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