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12.Practice.Tests.for.the.SAT_2015-2016_1128p

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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 565<br />

I<br />

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

OD<br />

P of one semicircle = nd + 6<br />

educated guess-you know that <strong>the</strong> slope of <strong>the</strong> line is<br />

negative, so k must be greater than 2, eliminating (A)<br />

and (B).<br />

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

2-k -l<br />

-- -<br />

3-0 2<br />

1_-js_ =<br />

=l_<br />

3 2<br />

4-2k=-3<br />

7=2k<br />

J_ =k<br />

2<br />

= 7t(6) + 6<br />

= 37t + 6<br />

P of two semicircles = 2(37t + 6) = 67t + 12<br />

19. A<br />

Difficulty: High<br />

Strategic Advice: The probability that a randomly selected<br />

point will fall within <strong>the</strong> shaded area is equal to <strong>the</strong> ratio of<br />

<strong>the</strong> area that is shaded to <strong>the</strong> area of <strong>the</strong> entire figure. The<br />

area of <strong>the</strong> entire figure is equal to <strong>the</strong> area of <strong>the</strong> largest<br />

circle, and <strong>the</strong> area of <strong>the</strong> shaded area is equal to <strong>the</strong> area<br />

of <strong>the</strong> second circle minus <strong>the</strong> area of <strong>the</strong> smallest circle.<br />

To make <strong>the</strong> calculations easier, you can assume that <strong>the</strong><br />

radius of <strong>the</strong> smallest circle equals l, so its diameter is 2.<br />

Then <strong>the</strong> radius of <strong>the</strong> second circle is 3, and <strong>the</strong> radius of<br />

<strong>the</strong> largest circle is 5.<br />

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

Shaded area:<br />

7t(32) - 7t( l 2) = 97t - 7t = 87t<br />

Total area of figure: 7t(52) = 257t<br />

b bl<br />

87t 8<br />

Pro a 11ty: = 257t 25<br />

20. c<br />

Difficulty: High<br />

Y - 2 Yi<br />

Strategic Advice: Use <strong>the</strong> slope <strong>for</strong>mula, m = ---, wit . h<br />

X2 - Xl<br />

<strong>the</strong> two given points to get an equation involving k. Then<br />

solve <strong>for</strong> k. If you find yourself running out of time, you<br />

can easily narrow down <strong>the</strong> answer choices and make an<br />

SECTION 4<br />

1. c<br />

Difficulty: Low<br />

Look <strong>for</strong> <strong>the</strong> most concise version of <strong>the</strong> selection that<br />

retains <strong>the</strong> meaning of <strong>the</strong> original sentence.<br />

This sentence is awkward and unnecessarily wordy. Choice<br />

(C) solves both of <strong>the</strong>se problems without adding any<br />

additional errors. Choice (B) introduces <strong>the</strong> passive voice<br />

unnecessarily. Choices (D) and (E) are grammatically<br />

incorrect in structure.<br />

2. B<br />

Difficulty: Medium<br />

In a compound predicate, both verbs must be in parallel<br />

<strong>for</strong>m.<br />

The verb phrase would increase should be to increase<br />

in order to parallel to hold; also, <strong>the</strong> pronoun <strong>the</strong>y is<br />

unnecessary. Choice (B) fixes both problems. Choice (C)<br />

is awkwardly worded and fails to make <strong>the</strong> verbs parallel.<br />

Choices (D) and (E) use transition words (<strong>for</strong> and thus),<br />

which are inappropriate in context.<br />

3. E<br />

Difficulty: Medium<br />

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

(main) verb in an independent clause.

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