| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.07 |
| Score | 0% | 61% |
A circular logo is enlarged to fit the lid of a jar. The new diameter is 30% larger than the original. By what percentage has the area of the logo increased?
| 35% | |
| 30% | |
| 22\(\frac{1}{2}\)% | |
| 15% |
The area of a circle is given by the formula A = πr2 where r is the radius of the circle. The radius of a circle is its diameter divided by two so A = π(\( \frac{d}{2} \))2. If the diameter of the logo increases by 30% the radius (and, consequently, the total area) increases by \( \frac{30\text{%}}{2} \) = 15%
A factor is a positive __________ that divides evenly into a given number.
mixed number |
|
fraction |
|
improper fraction |
|
integer |
A factor is a positive integer that divides evenly into a given number. For example, the factors of 8 are 1, 2, 4, and 8.
What is 6\( \sqrt{5} \) x 8\( \sqrt{5} \)?
| 14\( \sqrt{5} \) | |
| 48\( \sqrt{5} \) | |
| 240 | |
| 14\( \sqrt{25} \) |
To multiply terms with radicals, multiply the coefficients and radicands separately:
6\( \sqrt{5} \) x 8\( \sqrt{5} \)
(6 x 8)\( \sqrt{5 \times 5} \)
48\( \sqrt{25} \)
Now we need to simplify the radical:
48\( \sqrt{25} \)
48\( \sqrt{5^2} \)
(48)(5)
240
What is \( \frac{4}{8} \) x \( \frac{3}{9} \)?
| \(\frac{1}{48}\) | |
| \(\frac{1}{6}\) | |
| \(\frac{1}{12}\) | |
| \(\frac{16}{45}\) |
To multiply fractions, multiply the numerators together and then multiply the denominators together:
\( \frac{4}{8} \) x \( \frac{3}{9} \) = \( \frac{4 x 3}{8 x 9} \) = \( \frac{12}{72} \) = \(\frac{1}{6}\)
If there were a total of 400 raffle tickets sold and you bought 32 tickets, what's the probability that you'll win the raffle?
| 7% | |
| 8% | |
| 4% | |
| 12% |
You have 32 out of the total of 400 raffle tickets sold so you have a (\( \frac{32}{400} \)) x 100 = \( \frac{32 \times 100}{400} \) = \( \frac{3200}{400} \) = 8% chance to win the raffle.