| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
If \( \left|c - 6\right| \) + 9 = 4, which of these is a possible value for c?
| 0 | |
| -7 | |
| 11 | |
| -4 |
First, solve for \( \left|c - 6\right| \):
\( \left|c - 6\right| \) + 9 = 4
\( \left|c - 6\right| \) = 4 - 9
\( \left|c - 6\right| \) = -5
The value inside the absolute value brackets can be either positive or negative so (c - 6) must equal - 5 or --5 for \( \left|c - 6\right| \) to equal -5:
| c - 6 = -5 c = -5 + 6 c = 1 | c - 6 = 5 c = 5 + 6 c = 11 |
So, c = 11 or c = 1.
What is \( 8 \)\( \sqrt{32} \) - \( 7 \)\( \sqrt{2} \)
| 25\( \sqrt{2} \) | |
| \( \sqrt{16} \) | |
| \( \sqrt{-12} \) | |
| 56\( \sqrt{64} \) |
To subtract these radicals together their radicands must be the same:
8\( \sqrt{32} \) - 7\( \sqrt{2} \)
8\( \sqrt{16 \times 2} \) - 7\( \sqrt{2} \)
8\( \sqrt{4^2 \times 2} \) - 7\( \sqrt{2} \)
(8)(4)\( \sqrt{2} \) - 7\( \sqrt{2} \)
32\( \sqrt{2} \) - 7\( \sqrt{2} \)
Now that the radicands are identical, you can subtract them:
32\( \sqrt{2} \) - 7\( \sqrt{2} \)What is the greatest common factor of 36 and 20?
| 17 | |
| 4 | |
| 11 | |
| 6 |
The factors of 36 are [1, 2, 3, 4, 6, 9, 12, 18, 36] and the factors of 20 are [1, 2, 4, 5, 10, 20]. They share 3 factors [1, 2, 4] making 4 the greatest factor 36 and 20 have in common.
A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 5% off." If Bob buys two shirts, each with a regular price of $35, how much money will he save?
| $10.50 | |
| $12.25 | |
| $1.75 | |
| $15.75 |
By buying two shirts, Bob will save $35 x \( \frac{5}{100} \) = \( \frac{$35 x 5}{100} \) = \( \frac{$175}{100} \) = $1.75 on the second shirt.
The __________ is the smallest positive integer that is a multiple of two or more integers.
least common multiple |
|
least common factor |
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greatest common factor |
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absolute value |
The least common multiple (LCM) is the smallest positive integer that is a multiple of two or more integers.