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300<br />

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 />

$2 <strong>for</strong> <strong>the</strong> first 14 days<br />

$4.55 - $2 = $2.55 <strong>for</strong> <strong>the</strong> rest of <strong>the</strong> days<br />

$ 255 = 17 additional days<br />

$ 0. 15<br />

17 + 14=31 days total<br />

12. 0<br />

Difficulty: Medium<br />

Strategic Advice: When <strong>the</strong> <strong>SAT</strong> presents new functions,<br />

<strong>the</strong> problem often looks more confusing than it actually is.<br />

Figure out how to operate <strong>the</strong> new function, <strong>the</strong>n plug in<br />

<strong>the</strong> numbers carefully.<br />

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

The & function simply instructs you to find <strong>the</strong> least prime<br />

number greater than <strong>the</strong> number given. In this case, <strong>the</strong><br />

least prime number greater than -1.32 is 2. The @ function<br />

tells you to find <strong>the</strong> largest even integer that is less than <strong>the</strong><br />

number given. In this case, <strong>the</strong> largest even integer below<br />

3.481 is 2. There<strong>for</strong>e, <strong>the</strong> final equation is 2 - 2 = 0.<br />

13. 5,225<br />

Difficulty: Medium<br />

Strategic Advice: If you are having trouble with this type<br />

of problem, draw a picture to help you decipher <strong>the</strong><br />

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

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

Perimeter = 300 meters<br />

One side = 55 meters<br />

You know that opposite sides of a rectangle are equal and<br />

that <strong>the</strong> perimeter is <strong>the</strong> sum of all four sides. You can use<br />

<strong>the</strong> perimeter to find <strong>the</strong> width:<br />

2w + 2(55) = 300<br />

2w= 190<br />

W=95<br />

=<br />

95<br />

55 55<br />

Area is length x width = 55 x 95 = 5,225 square meters.<br />

95<br />

14. l or 0.4<br />

5<br />

Difficulty: Medium<br />

Strategic Advice: Use <strong>the</strong> slope <strong>for</strong>mula to find <strong>the</strong> slope<br />

on Test Day.<br />

Getting to <strong>the</strong> Answer: Use <strong>the</strong> slope <strong>for</strong>mula to get <strong>the</strong><br />

answer:<br />

h-Yi _<br />

1 -(-1) _<br />

±_<br />

X2 - X 1<br />

- 0 - (-5)<br />

- 5<br />

15. 60

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