| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.09 |
| Score | 0% | 62% |
\({b + c \over a} = {b \over a} + {c \over a}\) defines which of the following?
distributive property for division |
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commutative property for multiplication |
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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 \( \sqrt{\frac{49}{16}} \)?
| 1\(\frac{1}{4}\) | |
| 1\(\frac{1}{3}\) | |
| 1 | |
| 1\(\frac{3}{4}\) |
To take the square root of a fraction, break the fraction into two separate roots then calculate the square root of the numerator and denominator separately:
\( \sqrt{\frac{49}{16}} \)
\( \frac{\sqrt{49}}{\sqrt{16}} \)
\( \frac{\sqrt{7^2}}{\sqrt{4^2}} \)
\( \frac{7}{4} \)
1\(\frac{3}{4}\)
What is \( \frac{18\sqrt{63}}{6\sqrt{9}} \)?
| \(\frac{1}{3}\) \( \sqrt{7} \) | |
| \(\frac{1}{3}\) \( \sqrt{\frac{1}{7}} \) | |
| 7 \( \sqrt{\frac{1}{3}} \) | |
| 3 \( \sqrt{7} \) |
To divide terms with radicals, divide the coefficients and radicands separately:
\( \frac{18\sqrt{63}}{6\sqrt{9}} \)
\( \frac{18}{6} \) \( \sqrt{\frac{63}{9}} \)
3 \( \sqrt{7} \)
If the ratio of home fans to visiting fans in a crowd is 3:1 and all 36,000 seats in a stadium are filled, how many home fans are in attendance?
| 21,333 | |
| 24,800 | |
| 27,000 | |
| 29,333 |
A ratio of 3:1 means that there are 3 home fans for every one visiting fan. So, of every 4 fans, 3 are home fans and \( \frac{3}{4} \) of every fan in the stadium is a home fan:
36,000 fans x \( \frac{3}{4} \) = \( \frac{108000}{4} \) = 27,000 fans.
If \( \left|z + 5\right| \) + 5 = -6, which of these is a possible value for z?
| 18 | |
| -10 | |
| 6 | |
| 4 |
First, solve for \( \left|z + 5\right| \):
\( \left|z + 5\right| \) + 5 = -6
\( \left|z + 5\right| \) = -6 - 5
\( \left|z + 5\right| \) = -11
The value inside the absolute value brackets can be either positive or negative so (z + 5) must equal - 11 or --11 for \( \left|z + 5\right| \) to equal -11:
| z + 5 = -11 z = -11 - 5 z = -16 | z + 5 = 11 z = 11 - 5 z = 6 |
So, z = 6 or z = -16.