... percentage of 90 is 18?
First translate the problem into math:
Now solve:
ᎏ
10
x
0
ᎏ
ϫ 90 ϭ 18
ᎏ
1
9
0
0
0
x
ᎏ
ϭ 18
ᎏ
1
9
0
x
ᎏ
ϭ 18
ᎏ
1
9
0
x
ᎏ
ϫ 10 ϭ 18 ϫ 10
9x ϭ 180
x ϭ 20
Answer: 18 is 20% of 90.
What ... 3.
Math:
ᎏ
1
1
0
0
0
ᎏ
ϫ 30 ϭ 3
■
The word what refers to a variable.
English: 20% of what equals 8?
Math:
ᎏ
1
2
0
0
0
ᎏ
ϫ a ϭ 8
■
The words is, are, and were, mean equa...
... practice essay, get more prompts from resources
such as Acing the SAT 2006 (LearningExpress, 2006) or
11 Practice Tests for the New SAT (Princeton Review,
2004).
Planning Your Essay
Planning takes ... in the months before the
SAT. When you encounter new words, notice their con-
text and look up their definitions in the dictionary.
Search the Internet with the terms SAT and vocabulary....
... find
its roots:
ᎏ
x
4
2
ᎏ
– 3x = 8
x
2
– 12x = –32
x
2
– 12x + 32 = 0
(x – 8) (x – 4) = 0
x – 8 = 0, x = 8
x – 4 = 0, x = 4
ᎏ
x
4
2
ᎏ
– 3x = 8 when x is either 4 or 8.
5. d. Factor the numerator ... 9 68
= (11)(11)h, 9 68 = 121h, h = 8. The prism
has two square faces and four rectangular
faces. The area of one square face is 121
square units. The area of one rectangular
face is (8)...
... x
2
Ϫ 6x ϩ 8
The answer is correct.
–ALGEBRA REVIEW–
78
Practice Question
If (x Ϫ 8) (x ϩ 5) ϭ 0, what are the two possible values of x?
a. x ϭ 8 and x ϭϪ5
b. x ϭ 8 and x ϭ 5
c. x ϭ 8 and x ϭ 0
d. ... (x Ϫ 8) (x ϩ 5) ϭ 0, then one (or both) of the factors must equal 0.
x Ϫ 8 ϭ 0 if x ϭ 8 because 8 8 ϭ 0.
x ϩ 5 ϭ 0 if x ϭϪ5 because Ϫ5 ϩ 5 ϭ 0.
Therefore, the two values of x t...