| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.93 |
| Score | 0% | 59% |
a(b + c) = ab + ac defines which of the following?
commutative property for multiplication |
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distributive property for division |
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commutative property for division |
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distributive property for multiplication |
The distributive property for multiplication helps in solving expressions like a(b + c). It specifies that the result of multiplying one number by the sum or difference of two numbers can be obtained by multiplying each number individually and then totaling the results: a(b + c) = ab + ac. For example, 4(10-5) = (4 x 10) - (4 x 5) = 40 - 20 = 20.
What is \( 5 \)\( \sqrt{48} \) - \( 6 \)\( \sqrt{3} \)
| -1\( \sqrt{3} \) | |
| -1\( \sqrt{-7} \) | |
| 14\( \sqrt{3} \) | |
| -1\( \sqrt{48} \) |
To subtract these radicals together their radicands must be the same:
5\( \sqrt{48} \) - 6\( \sqrt{3} \)
5\( \sqrt{16 \times 3} \) - 6\( \sqrt{3} \)
5\( \sqrt{4^2 \times 3} \) - 6\( \sqrt{3} \)
(5)(4)\( \sqrt{3} \) - 6\( \sqrt{3} \)
20\( \sqrt{3} \) - 6\( \sqrt{3} \)
Now that the radicands are identical, you can subtract them:
20\( \sqrt{3} \) - 6\( \sqrt{3} \)If \( \left|y - 2\right| \) - 3 = -6, which of these is a possible value for y?
| -7 | |
| 7 | |
| -6 | |
| 5 |
First, solve for \( \left|y - 2\right| \):
\( \left|y - 2\right| \) - 3 = -6
\( \left|y - 2\right| \) = -6 + 3
\( \left|y - 2\right| \) = -3
The value inside the absolute value brackets can be either positive or negative so (y - 2) must equal - 3 or --3 for \( \left|y - 2\right| \) to equal -3:
| y - 2 = -3 y = -3 + 2 y = -1 | y - 2 = 3 y = 3 + 2 y = 5 |
So, y = 5 or y = -1.
If there were a total of 450 raffle tickets sold and you bought 9 tickets, what's the probability that you'll win the raffle?
| 5% | |
| 17% | |
| 2% | |
| 1% |
You have 9 out of the total of 450 raffle tickets sold so you have a (\( \frac{9}{450} \)) x 100 = \( \frac{9 \times 100}{450} \) = \( \frac{900}{450} \) = 2% chance to win the raffle.
The total water usage for a city is 10,000 gallons each day. Of that total, 28% is for personal use and 44% is for industrial use. How many more gallons of water each day is consumed for industrial use over personal use?
| 1,600 | |
| 6,000 | |
| 8,250 | |
| 8,750 |
44% of the water consumption is industrial use and 28% is personal use so (44% - 28%) = 16% more water is used for industrial purposes. 10,000 gallons are consumed daily so industry consumes \( \frac{16}{100} \) x 10,000 gallons = 1,600 gallons.