| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
If \( \left|y - 4\right| \) + 5 = -8, which of these is a possible value for y?
| -10 | |
| 9 | |
| -9 | |
| -13 |
First, solve for \( \left|y - 4\right| \):
\( \left|y - 4\right| \) + 5 = -8
\( \left|y - 4\right| \) = -8 - 5
\( \left|y - 4\right| \) = -13
The value inside the absolute value brackets can be either positive or negative so (y - 4) must equal - 13 or --13 for \( \left|y - 4\right| \) to equal -13:
| y - 4 = -13 y = -13 + 4 y = -9 | y - 4 = 13 y = 13 + 4 y = 17 |
So, y = 17 or y = -9.
a(b + c) = ab + ac defines which of the following?
distributive property for division |
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distributive property for multiplication |
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commutative property for multiplication |
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commutative property for division |
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 \( \frac{6}{3} \) - \( \frac{8}{9} \)?
| 1 \( \frac{1}{9} \) | |
| \( \frac{1}{9} \) | |
| 1 \( \frac{6}{9} \) | |
| 1\(\frac{1}{9}\) |
To subtract these fractions, first find the lowest common multiple of their denominators. The first few multiples of 3 are [3, 6, 9, 12, 15, 18, 21, 24, 27, 30] and the first few multiples of 9 are [9, 18, 27, 36, 45, 54, 63, 72, 81, 90]. The first few multiples they share are [9, 18, 27, 36, 45] making 9 the smallest multiple 3 and 9 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{6 x 3}{3 x 3} \) - \( \frac{8 x 1}{9 x 1} \)
\( \frac{18}{9} \) - \( \frac{8}{9} \)
Now, because the fractions share a common denominator, you can subtract them:
\( \frac{18 - 8}{9} \) = \( \frac{10}{9} \) = 1\(\frac{1}{9}\)
Which of the following is not an integer?
0 |
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-1 |
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1 |
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\({1 \over 2}\) |
An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.
Convert a-5 to remove the negative exponent.
| \( \frac{1}{a^5} \) | |
| \( \frac{-5}{a} \) | |
| \( \frac{-1}{-5a} \) | |
| \( \frac{-1}{a^{-5}} \) |
To convert a negative exponent to a positive exponent, calculate the positive exponent then take the reciprocal.