| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.38 |
| Score | 0% | 68% |
If \( \left|x + 6\right| \) + 9 = 7, which of these is a possible value for x?
| -9 | |
| -8 | |
| -11 | |
| -7 |
First, solve for \( \left|x + 6\right| \):
\( \left|x + 6\right| \) + 9 = 7
\( \left|x + 6\right| \) = 7 - 9
\( \left|x + 6\right| \) = -2
The value inside the absolute value brackets can be either positive or negative so (x + 6) must equal - 2 or --2 for \( \left|x + 6\right| \) to equal -2:
| x + 6 = -2 x = -2 - 6 x = -8 | x + 6 = 2 x = 2 - 6 x = -4 |
So, x = -4 or x = -8.
What is (c5)2?
| c7 | |
| c3 | |
| c10 | |
| 2c5 |
To raise a term with an exponent to another exponent, retain the base and multiply the exponents:
(c5)2What is \( \frac{2}{6} \) ÷ \( \frac{3}{6} \)?
| \(\frac{2}{3}\) | |
| \(\frac{2}{15}\) | |
| \(\frac{2}{27}\) | |
| \(\frac{1}{7}\) |
To divide fractions, invert the second fraction and then multiply:
\( \frac{2}{6} \) ÷ \( \frac{3}{6} \) = \( \frac{2}{6} \) x \( \frac{6}{3} \)
To multiply fractions, multiply the numerators together and then multiply the denominators together:
\( \frac{2}{6} \) x \( \frac{6}{3} \) = \( \frac{2 x 6}{6 x 3} \) = \( \frac{12}{18} \) = \(\frac{2}{3}\)
Simplify \( \frac{40}{44} \).
| \( \frac{10}{11} \) | |
| \( \frac{5}{12} \) | |
| \( \frac{1}{2} \) | |
| \( \frac{2}{9} \) |
To simplify this fraction, first find the greatest common factor between them. The factors of 40 are [1, 2, 4, 5, 8, 10, 20, 40] and the factors of 44 are [1, 2, 4, 11, 22, 44]. They share 3 factors [1, 2, 4] making 4 their greatest common factor (GCF).
Next, divide both numerator and denominator by the GCF:
\( \frac{40}{44} \) = \( \frac{\frac{40}{4}}{\frac{44}{4}} \) = \( \frac{10}{11} \)
If the ratio of home fans to visiting fans in a crowd is 2:1 and all 47,000 seats in a stadium are filled, how many home fans are in attendance?
| 38,400 | |
| 25,600 | |
| 31,333 | |
| 32,500 |
A ratio of 2:1 means that there are 2 home fans for every one visiting fan. So, of every 3 fans, 2 are home fans and \( \frac{2}{3} \) of every fan in the stadium is a home fan:
47,000 fans x \( \frac{2}{3} \) = \( \frac{94000}{3} \) = 31,333 fans.