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1072<br />

1 12 Practice <strong>Tests</strong> <strong>for</strong> <strong>the</strong> <strong>SAT</strong><br />

Practice Test Twelve Answers and Explanations<br />

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

(A) 2 + _l_ = 21- 2 2<br />

(B) 2 - _l_ = l _l_<br />

2 2<br />

(C) _l_ - 2 = -1 _l_<br />

2 2<br />

(D) 2x+= 1<br />

(E) 2 -+- _l_ = 4 2<br />

Choice (C) is <strong>the</strong> smallest.<br />

5. B<br />

Difficulty: Medium<br />

Strategic Advice: The side opposite a larger angle is<br />

<strong>the</strong> larger side. Find <strong>the</strong> missing angle, <strong>the</strong>n use <strong>the</strong><br />

relationships between <strong>the</strong> angles to find <strong>the</strong> relationships<br />

between <strong>the</strong> sides.<br />

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

LS = 180 - ( l 10 + 55) = 15<br />

PS is <strong>the</strong> longest side because it is opposite <strong>the</strong> 110° angle.<br />

RS is shorter than PS but longer than PR. There<strong>for</strong>e,<br />

6 + y > 6 + z > 6. You can simplify this inequality to y> z > 0.<br />

(A) This may or may not be true; eliminate<br />

(B) This may or may not be true; eliminate<br />

(C) Not possible; eliminate<br />

(D) Correct<br />

(E) Not possible; eliminate<br />

6. A<br />

Difficulty: Medium<br />

Strategic Advice: Don't let <strong>the</strong> A scare you. Just plug <strong>the</strong><br />

values into <strong>the</strong> equation.<br />

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

x=4 andy=2<br />

(x - yy + (x + y)Y<br />

(4 - 2)4 + (4 + 2)2<br />

(2)4 + (6)2<br />

16 + 36= 52<br />

7. c<br />

Difficulty: Medium<br />

Strategic Advice: When a transversal crosses parallel lines, all<br />

acute angles are equal and all obtuse angles are equal. So <strong>the</strong><br />

angle opposite <strong>the</strong> transversal from c is equal to d, and <strong>the</strong><br />

angle opposite <strong>the</strong> transversal from b is equal to a, as shown:<br />

-+ el<br />

---r e2<br />

....,-<br />

00<br />

e3<br />

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

Since c and d make up a straight line, c + d = 180.<br />

Since a and b make up a straight line, a + b = 180.<br />

So a + b + c + d = 180 + 180 = 360.<br />

8. B<br />

Difficulty: Medium -<br />

Strategic Advice: This is a great problem to help you<br />

practice your English-to-math translation skills. Translate<br />

each part of <strong>the</strong> word problem into an equation and <strong>the</strong>n<br />

solve.<br />

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

x+4-2=2x<br />

X=2<br />

9. c<br />

Difficulty: Medium<br />

Strategic Advice: Sketching a figure may help you organize<br />

<strong>the</strong> in<strong>for</strong>mation quickly.<br />

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

The question asks <strong>for</strong> <strong>the</strong> measure of <strong>the</strong> largest angle, so<br />

set that equal to x. The measure of <strong>the</strong> middle-sized angle<br />

is 40 degrees less than <strong>the</strong> degree measure of <strong>the</strong> largest<br />

angle, or x - 40. The measure of <strong>the</strong> smallest angle is 20<br />

degrees. The sum of <strong>the</strong> measures of <strong>the</strong> three interior<br />

angles of any triangle is 180 degrees.<br />

x + (x - 40) + 20 = 180<br />

x + x - 40 + 20 = 180<br />

2x - 20= 180<br />

2x = 200<br />

X= 100

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