| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
\({b + c \over a} = {b \over a} + {c \over a}\) 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 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, \({a^3 + 6a^2 \over a^2} = {a^3 \over a^2} + {6a^2 \over a^2} = a + 6\).
What is \( \frac{6}{2} \) - \( \frac{7}{6} \)?
| 1 \( \frac{5}{9} \) | |
| 1 \( \frac{5}{10} \) | |
| 1 \( \frac{2}{6} \) | |
| 1\(\frac{5}{6}\) |
To subtract these fractions, first find the lowest common multiple of their denominators. The first few multiples of 2 are [2, 4, 6, 8, 10, 12, 14, 16, 18, 20] and the first few multiples of 6 are [6, 12, 18, 24, 30, 36, 42, 48, 54, 60]. The first few multiples they share are [6, 12, 18, 24, 30] making 6 the smallest multiple 2 and 6 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{6 x 3}{2 x 3} \) - \( \frac{7 x 1}{6 x 1} \)
\( \frac{18}{6} \) - \( \frac{7}{6} \)
Now, because the fractions share a common denominator, you can subtract them:
\( \frac{18 - 7}{6} \) = \( \frac{11}{6} \) = 1\(\frac{5}{6}\)
Which of these numbers is a factor of 48?
| 4 | |
| 34 | |
| 12 | |
| 51 |
The factors of a number are all positive integers that divide evenly into the number. The factors of 48 are 1, 2, 3, 4, 6, 8, 12, 16, 24, 48.
What is 3c3 x 7c3?
| 10c9 | |
| 21c6 | |
| 21c3 | |
| 10c3 |
To multiply terms with exponents, the base of both exponents must be the same. In this case they are so multiply the coefficients and add the exponents:
3c3 x 7c3
(3 x 7)c(3 + 3)
21c6
4! = ?
5 x 4 x 3 x 2 x 1 |
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3 x 2 x 1 |
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4 x 3 x 2 x 1 |
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4 x 3 |
A factorial has the form n! and is the product of the integer (n) and all the positive integers below it. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.