| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.94 |
| Score | 0% | 59% |
If \( \left|y - 6\right| \) + 3 = 7, which of these is a possible value for y?
| -25 | |
| -1 | |
| 10 | |
| -6 |
First, solve for \( \left|y - 6\right| \):
\( \left|y - 6\right| \) + 3 = 7
\( \left|y - 6\right| \) = 7 - 3
\( \left|y - 6\right| \) = 4
The value inside the absolute value brackets can be either positive or negative so (y - 6) must equal + 4 or -4 for \( \left|y - 6\right| \) to equal 4:
| y - 6 = 4 y = 4 + 6 y = 10 | y - 6 = -4 y = -4 + 6 y = 2 |
So, y = 2 or y = 10.
This property states taht the order of addition or multiplication does not mater. For example, 2 + 5 and 5 + 2 are equivalent.
associative |
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commutative |
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distributive |
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PEDMAS |
The commutative property states that, when adding or multiplying numbers, the order in which they're added or multiplied does not matter. For example, 3 + 4 and 4 + 3 give the same result, as do 3 x 4 and 4 x 3.
What is \( 6 \)\( \sqrt{125} \) - \( 5 \)\( \sqrt{5} \)
| 30\( \sqrt{125} \) | |
| \( \sqrt{25} \) | |
| 30\( \sqrt{5} \) | |
| 25\( \sqrt{5} \) |
To subtract these radicals together their radicands must be the same:
6\( \sqrt{125} \) - 5\( \sqrt{5} \)
6\( \sqrt{25 \times 5} \) - 5\( \sqrt{5} \)
6\( \sqrt{5^2 \times 5} \) - 5\( \sqrt{5} \)
(6)(5)\( \sqrt{5} \) - 5\( \sqrt{5} \)
30\( \sqrt{5} \) - 5\( \sqrt{5} \)
Now that the radicands are identical, you can subtract them:
30\( \sqrt{5} \) - 5\( \sqrt{5} \)What is the least common multiple of 8 and 16?
| 47 | |
| 58 | |
| 55 | |
| 16 |
The first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80] and the first few multiples of 16 are [16, 32, 48, 64, 80, 96]. The first few multiples they share are [16, 32, 48, 64, 80] making 16 the smallest multiple 8 and 16 have in common.
If there were a total of 350 raffle tickets sold and you bought 14 tickets, what's the probability that you'll win the raffle?
| 7% | |
| 1% | |
| 19% | |
| 4% |
You have 14 out of the total of 350 raffle tickets sold so you have a (\( \frac{14}{350} \)) x 100 = \( \frac{14 \times 100}{350} \) = \( \frac{1400}{350} \) = 4% chance to win the raffle.