| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.63 |
| Score | 0% | 73% |
What is the greatest common factor of 76 and 24?
| 4 | |
| 8 | |
| 17 | |
| 12 |
The factors of 76 are [1, 2, 4, 19, 38, 76] and the factors of 24 are [1, 2, 3, 4, 6, 8, 12, 24]. They share 3 factors [1, 2, 4] making 4 the greatest factor 76 and 24 have in common.
Which of the following is not an integer?
\({1 \over 2}\) |
|
-1 |
|
0 |
|
1 |
An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.
Simplify \( \frac{40}{72} \).
| \( \frac{5}{9} \) | |
| \( \frac{4}{19} \) | |
| \( \frac{5}{18} \) | |
| \( \frac{2}{3} \) |
To simplify this fraction, first find the greatest common factor between them. The factors of 40 are [1, 2, 4, 5, 8, 10, 20, 40] and the factors of 72 are [1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72]. They share 4 factors [1, 2, 4, 8] making 8 their greatest common factor (GCF).
Next, divide both numerator and denominator by the GCF:
\( \frac{40}{72} \) = \( \frac{\frac{40}{8}}{\frac{72}{8}} \) = \( \frac{5}{9} \)
What is \( \sqrt{\frac{81}{64}} \)?
| \(\frac{1}{3}\) | |
| 1\(\frac{1}{8}\) | |
| \(\frac{5}{9}\) | |
| \(\frac{6}{7}\) |
To take the square root of a fraction, break the fraction into two separate roots then calculate the square root of the numerator and denominator separately:
\( \sqrt{\frac{81}{64}} \)
\( \frac{\sqrt{81}}{\sqrt{64}} \)
\( \frac{\sqrt{9^2}}{\sqrt{8^2}} \)
\( \frac{9}{8} \)
1\(\frac{1}{8}\)
If \( \left|c + 5\right| \) - 8 = 3, which of these is a possible value for c?
| -16 | |
| -9 | |
| 9 | |
| -1 |
First, solve for \( \left|c + 5\right| \):
\( \left|c + 5\right| \) - 8 = 3
\( \left|c + 5\right| \) = 3 + 8
\( \left|c + 5\right| \) = 11
The value inside the absolute value brackets can be either positive or negative so (c + 5) must equal + 11 or -11 for \( \left|c + 5\right| \) to equal 11:
| c + 5 = 11 c = 11 - 5 c = 6 | c + 5 = -11 c = -11 - 5 c = -16 |
So, c = -16 or c = 6.