| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.73 |
| Score | 0% | 55% |
If the ratio of home fans to visiting fans in a crowd is 4:1 and all 45,000 seats in a stadium are filled, how many home fans are in attendance?
| 27,200 | |
| 28,667 | |
| 28,333 | |
| 36,000 |
A ratio of 4:1 means that there are 4 home fans for every one visiting fan. So, of every 5 fans, 4 are home fans and \( \frac{4}{5} \) of every fan in the stadium is a home fan:
45,000 fans x \( \frac{4}{5} \) = \( \frac{180000}{5} \) = 36,000 fans.
What is \( 4 \)\( \sqrt{32} \) - \( 3 \)\( \sqrt{2} \)
| \( \sqrt{-12} \) | |
| 12\( \sqrt{16} \) | |
| 13\( \sqrt{2} \) | |
| \( \sqrt{16} \) |
To subtract these radicals together their radicands must be the same:
4\( \sqrt{32} \) - 3\( \sqrt{2} \)
4\( \sqrt{16 \times 2} \) - 3\( \sqrt{2} \)
4\( \sqrt{4^2 \times 2} \) - 3\( \sqrt{2} \)
(4)(4)\( \sqrt{2} \) - 3\( \sqrt{2} \)
16\( \sqrt{2} \) - 3\( \sqrt{2} \)
Now that the radicands are identical, you can subtract them:
16\( \sqrt{2} \) - 3\( \sqrt{2} \)What is 8\( \sqrt{8} \) x 6\( \sqrt{3} \)?
| 96\( \sqrt{6} \) | |
| 48\( \sqrt{3} \) | |
| 14\( \sqrt{8} \) | |
| 14\( \sqrt{3} \) |
To multiply terms with radicals, multiply the coefficients and radicands separately:
8\( \sqrt{8} \) x 6\( \sqrt{3} \)
(8 x 6)\( \sqrt{8 \times 3} \)
48\( \sqrt{24} \)
Now we need to simplify the radical:
48\( \sqrt{24} \)
48\( \sqrt{6 \times 4} \)
48\( \sqrt{6 \times 2^2} \)
(48)(2)\( \sqrt{6} \)
96\( \sqrt{6} \)
What is \( \frac{-8y^8}{9y^3} \)?
| -\(\frac{8}{9}\)y5 | |
| -\(\frac{8}{9}\)y\(\frac{3}{8}\) | |
| -\(\frac{8}{9}\)y24 | |
| -1\(\frac{1}{8}\)y11 |
To divide terms with exponents, the base of both exponents must be the same. In this case they are so divide the coefficients and subtract the exponents:
\( \frac{-8y^8}{9y^3} \)
\( \frac{-8}{9} \) y(8 - 3)
-\(\frac{8}{9}\)y5
How many hours does it take a car to travel 300 miles at an average speed of 60 miles per hour?
| 5 hours | |
| 1 hour | |
| 2 hours | |
| 9 hours |
Average speed in miles per hour is the number of miles traveled divided by the number of hours:
speed = \( \frac{\text{distance}}{\text{time}} \)Solving for time:
time = \( \frac{\text{distance}}{\text{speed}} \)
time = \( \frac{300mi}{60mph} \)
5 hours