epdf.pub_cbest-cliffs-test-prep13a9b242c7cb4125e6cca92d00a73d5a41681

Answers and Complete Explanations for Practice Test 3
16. D. The new dimensions are:
8″
(5+3)
10″
(7+3)
Note: Perimeter is the distance around. Think perimeter (rim). Simply add the sides
^10 + 8 + 10 + 8h=
36 inches.
Or apply the perimeter formula:
2_
lengthi
+ 2^widthh
= perimeter
210 ^ h+ 28 ^ h= 20+ 16=
36inches
17. B. To purchase 12 tapes, Roy must buy 6 packages. At $2.98 per package, he spends
$17.88. His change from a $20 bill will be $ 20. 00 - $ 17. 88 = $ 2.
12.
18. D. Solving the equation 2x+ 4- 2x= 3x+ 3, first subtract 2x from each side:
2x+ 4- 2x= 3x+ 3-2x
4= x + 3
Now subtract 3 from both sides:
4- 3= x + 3-3
1=x
By plugging in the value of x (that is, 1) for each of the answer choices, you find that 1
satisfies all the equations except choice D.
Does x=- 1? No.
1! -1
Therefore, D is the correct answer.
19. B. Note that all choices except B are larger than 1 ⁄2. Choice B, 4 ⁄9, is smaller than 1 ⁄2.
20. B. 210,000 is equivalent to _ 2# 10 5 i+
_ 1#
10
4
i. A fast way of figuring this is to count the
number of places to the right of each digit that is not zero. For instance,
210,000 Note that there are 5 places to the right of the 2, thus 2# 10 5
.
210,000 There are 4 places to the right of the 1, thus, 1# 10 4
.
So 210,000 may also be written _ 2# 10 5 i+
_ 1#
10
4
i.
21. C. If the product of two numbers equals one of the numbers, then ^ xh_
yi = x. If this product
is more than 0, neither of the numbers may be zero. Therefore, y must be 1:x
^ h^1 h = x.
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