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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 Three Answers and Explanations<br />

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

a + b +c= 180<br />

7 c + 2c + c = 1 80<br />

4. D<br />

lOc= 180<br />

c= 18<br />

Difficulty: Low<br />

Strategic Advice: Don't overthink this one-<strong>the</strong> x6 is on<br />

each side and can be subtracted from both sides.<br />

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

Subtract x6 from both sides to get 4 = w.<br />

5. c<br />

Difficulty: Medium<br />

Strategic Advice: Remember key triangle rules on Test Day:<br />

<strong>the</strong> sum of <strong>the</strong> interior angles is 1 80°, and triangles with two<br />

equal sides also have two equal angles.<br />

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

OA and OB are radii of <strong>the</strong> circle, so <strong>the</strong>y are equal. This<br />

means that angles OAB and ABO are equal as well. The<br />

interior angles of <strong>the</strong> triangle total 1 80°, and angle AOB<br />

is 70°. There<strong>for</strong>e, ABO +ABO + 70° = 180°.<br />

2ABO = 1 10°<br />

ABO = 55°<br />

6. A<br />

Difficulty: Medium<br />

Strategic Advice: When you are presented with a new<br />

function, it might look complicated. As long as you plug in<br />

numbers carefully, <strong>the</strong>se types of questions are easier than<br />

<strong>the</strong>y appear.<br />

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

Plug in <strong>the</strong> given numbers.<br />

1,007 + 2(3.5) -<br />

1,007 + 7 -<br />

1,014<br />

1,007 - 2(3.5) - 1,007 - 7 - 1,000<br />

Change to <strong>the</strong> decimal equivalent, which is 1 .0 14, whic is (A).<br />

7. E<br />

Difficulty: Medium<br />

Strategic Advice: Be sure to draw in any in<strong>for</strong>mation that is<br />

given in <strong>the</strong> question stem but not included in <strong>the</strong> diagram.<br />

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

If <strong>the</strong> whole side is 8, each smaller square has a side length<br />

of 2. The radius of <strong>the</strong> circle is <strong>for</strong>med by one and one-half<br />

diagonals of <strong>the</strong> square. Each diagonal is 2\/2, so <strong>the</strong> entire<br />

2\/2<br />

radius is 2\/2 + - 2 - = 3v'2.<br />

Area of circle = 7t(3V2)2 = 187t<br />

8. c<br />

Difficulty: Medium<br />

Strategic Advice: Be sure to distinguish between <strong>the</strong> terms<br />

with, possibly, and without.<br />

Getting to <strong>the</strong> Answer: The shaded area includes all salads<br />

with onions and peppers. Some of <strong>the</strong>se possibly have<br />

tomatoes as well, as <strong>the</strong> shaded region overlaps into <strong>the</strong><br />

tomatoes region.<br />

9. B<br />

Difficulty: Medium<br />

Strategic Advice: Take this carefully, step-by-step, as you<br />

translate from English to math.<br />

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

She spends 350/o of $400 to pay bills; that is,<br />

x $400 = $ 140. That leaves her with $400 - $140 =<br />

100<br />

$260. She budgets 300/o of this <strong>for</strong> shopping; that is,<br />

_2Q_ x $260 = $78. That leaves $260 - $78 = $ 1 82. Of<br />

100<br />

this, she allots $130 <strong>for</strong> entertainment, leaving '<br />

$182 - $ 130 = $52 to save. Finally, $52 as a percent of <strong>the</strong><br />

original $400 is $52 x 1000/o = 130/o.<br />

$400

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