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12 Practice <strong>Tests</strong> <strong>for</strong> <strong>the</strong> <strong>SAT</strong><br />

Practice Test Six Answers and Explanations 587<br />

I<br />

16. c<br />

Difficulty: High<br />

Strategic Advice: Visualizing a three-dimensional diagram<br />

can be difficult. Redraw this diagram if necessary. Be sure to<br />

label what you know as you work through <strong>the</strong> problem.<br />

Getting to <strong>the</strong> Answer:<br />

B<br />

@jJ<br />

y F<br />

We're essentially trying to work out two Pythagorean<br />

<strong>the</strong>orems, once <strong>for</strong> <strong>the</strong> XF base of <strong>the</strong> cube and once again<br />

<strong>for</strong> BF. Looking at <strong>the</strong> base of <strong>the</strong> cube, since XY and YF are<br />

both 3, <strong>the</strong> base <strong>for</strong>ms a 45-45-90 right triangle with sides<br />

in <strong>the</strong> ratio of x:x:x\/2 . There<strong>for</strong>e, <strong>the</strong> hypotenuse is 3\/2.<br />

Now let's find BF. This diagonal is a hypotenuse of a<br />

right triangle with legs of 3 and 3v'2, so let's apply <strong>the</strong><br />

Pythagorean <strong>the</strong>orem:<br />

32 + (3\/2)2 = BF2<br />

9 + (9)(2) = Bf2<br />

9 + 18 =BF2<br />

27 =BF2<br />

BF=Yn =V9V3 =3v3<br />

SECTION 9<br />

1. B<br />

Difficulty: Medium<br />

Make sure that transition words and phrases correctly<br />

establish <strong>the</strong> relationship between <strong>the</strong> ideas <strong>the</strong>y connect.<br />

This sentence describes a cause (<strong>the</strong> Internet's enabling<br />

communication in a cost-effective way) and its effect (<strong>the</strong><br />

Internet's usefulness). Choice (B) correctly expresses this<br />

relationship. Choices (A) and (D) reverse <strong>the</strong> cause and<br />

effect. Choice (C) expresses a contrast that is inappropriate<br />

in context. In (E), <strong>the</strong> plural pronoun <strong>the</strong>y does not agree<br />

with its singular antecedent, <strong>the</strong> Internet.<br />

2. A<br />

Difficulty: Medium<br />

Being methodical about eliminating wrong answer choices<br />

will help you spot sentences that are correct as written.<br />

This sentence contains no error. Choice (B) is incorrect<br />

grammatical structure. Choices (C), (D), and (E) are<br />

unnecessarily wordy.<br />

3. D<br />

Difficulty: Medium<br />

The gerund (-ing) verb <strong>for</strong>m can never be <strong>the</strong> main verb in<br />

a sentence.<br />

This sentence is a fragment. Choice (D) corrects it by<br />

replacing <strong>the</strong> gerund with a predicate verb <strong>for</strong>m, promises.<br />

Choice (B) does not address <strong>the</strong> error. Choice (C) is<br />

incorrect grammatical structure. Choice (E) leaves <strong>the</strong><br />

meaning of <strong>the</strong> sentence incomplete.<br />

4. D<br />

Difficulty: Medium<br />

Look <strong>for</strong> <strong>the</strong> most concise choice that doesn't violate<br />

grammatical rules or <strong>the</strong> alter <strong>the</strong> sentence's original<br />

meaning. Choice (D) expresses all of <strong>the</strong> meaning of <strong>the</strong><br />

original sentence without introducing any additional errors.<br />

In (B), <strong>the</strong> use of both generally and mostly is redundant.<br />

Choice (C) is awkward and uses a plural verb, are, with a<br />

singular subject, sleep. Choice (E) is idiomatically incorrect.<br />

5. D<br />

Difficulty: Medium<br />

Items in a series or list must be presented in parallel <strong>for</strong>m.<br />

The women are becoming specialists, not specialties. Choice<br />

(D) corrects <strong>the</strong> error; none of <strong>the</strong> o<strong>the</strong>r choices do so.<br />

6. c<br />

Difficulty: Medium<br />

One way to correct a run-on sentence is to make one of<br />

<strong>the</strong> clauses subordinate. Choice (C) corrects <strong>the</strong> run-on by<br />

making <strong>the</strong> second independent clause dependent. Choice<br />

(B) is incorrect grammatical structure. Choice (D) merely<br />

joins <strong>the</strong> clauses with and; while this is not technically a runon,<br />

it is not considered good <strong>SAT</strong> style. Choice (E) does not<br />

address <strong>the</strong> error.

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