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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 />

824 Practice Test Nine Answers and Explanations<br />

2. E<br />

Difficulty: Low<br />

Strategic Advice: With combination problems, <strong>the</strong> trick is<br />

to multiply <strong>the</strong> components toge<strong>the</strong>r. This should make<br />

sense-just think that <strong>for</strong> each of <strong>the</strong> 7 entrees, <strong>the</strong>re are 4<br />

appetizer choices, so you need to multiply 7 times 4.<br />

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

7(4) = 28<br />

3. A<br />

Difficulty: Low<br />

Strategic Advice: This is just a substitution problem;<br />

<strong>the</strong> only catch is that it has two steps. Since you have a<br />

numerical value <strong>for</strong> z, plug that in first, and <strong>the</strong>n you'll have<br />

a numerical value <strong>for</strong> y to plug into <strong>the</strong> first equation.<br />

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

y =z+2<br />

y =4+2<br />

y =6<br />

Then, substitute 6 <strong>for</strong> y:<br />

x+ 2y = 14<br />

x + 2(6) = 14<br />

x+ 12=14<br />

X=2<br />

4. A<br />

Difficulty: Medium<br />

Strategic Advice: If a fraction equals zero, <strong>the</strong>n its<br />

numerator equals zero. (If <strong>the</strong> denominator of a fraction<br />

equals zero, <strong>the</strong>n that fraction is undefined.)<br />

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

=0<br />

x<br />

5. c<br />

x+y=O<br />

x=-y<br />

Difficulty: Low<br />

Strategic Advice: Don't let yourself get confused by word<br />

problems with lots of variables.<br />

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

Laurel is taller than Nick: N < L<br />

Laurel is shorter than Vince: L < V<br />

So, N

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