| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
\({b + c \over a} = {b \over a} + {c \over a}\) defines which of the following?
commutative property for multiplication |
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commutative property for division |
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distributive property for multiplication |
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distributive property for division |
The distributive property for division helps in solving expressions like \({b + c \over a}\). It specifies that the result of dividing a fraction with multiple terms in the numerator and one term in the denominator can be obtained by dividing each term individually and then totaling the results: \({b + c \over a} = {b \over a} + {c \over a}\). For example, \({a^3 + 6a^2 \over a^2} = {a^3 \over a^2} + {6a^2 \over a^2} = a + 6\).
If \(\left|a\right| = 7\), which of the following best describes a?
a = -7 |
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a = 7 |
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none of these is correct |
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a = 7 or a = -7 |
The absolute value is the positive magnitude of a particular number or variable and is indicated by two vertical lines: \(\left|-5\right| = 5\). In the case of a variable absolute value (\(\left|a\right| = 5\)) the value of a can be either positive or negative (a = -5 or a = 5).
What is \( 2 \)\( \sqrt{75} \) + \( 3 \)\( \sqrt{3} \)
| 5\( \sqrt{3} \) | |
| 6\( \sqrt{3} \) | |
| 13\( \sqrt{3} \) | |
| 6\( \sqrt{225} \) |
To add these radicals together their radicands must be the same:
2\( \sqrt{75} \) + 3\( \sqrt{3} \)
2\( \sqrt{25 \times 3} \) + 3\( \sqrt{3} \)
2\( \sqrt{5^2 \times 3} \) + 3\( \sqrt{3} \)
(2)(5)\( \sqrt{3} \) + 3\( \sqrt{3} \)
10\( \sqrt{3} \) + 3\( \sqrt{3} \)
Now that the radicands are identical, you can add them together:
10\( \sqrt{3} \) + 3\( \sqrt{3} \)What is -5b3 - 2b3?
| -3b-6 | |
| 7b3 | |
| -7b3 | |
| -3b3 |
To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:
-5b3 - 2b3
(-5 - 2)b3
-7b3
a(b + c) = ab + ac defines which of the following?
commutative property for division |
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distributive property for division |
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commutative property for multiplication |
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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.