| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.45 |
| Score | 0% | 49% |
What is \( 9 \)\( \sqrt{125} \) + \( 9 \)\( \sqrt{5} \)
| 54\( \sqrt{5} \) | |
| 81\( \sqrt{125} \) | |
| 81\( \sqrt{625} \) | |
| 81\( \sqrt{5} \) |
To add these radicals together their radicands must be the same:
9\( \sqrt{125} \) + 9\( \sqrt{5} \)
9\( \sqrt{25 \times 5} \) + 9\( \sqrt{5} \)
9\( \sqrt{5^2 \times 5} \) + 9\( \sqrt{5} \)
(9)(5)\( \sqrt{5} \) + 9\( \sqrt{5} \)
45\( \sqrt{5} \) + 9\( \sqrt{5} \)
Now that the radicands are identical, you can add them together:
45\( \sqrt{5} \) + 9\( \sqrt{5} \)If a rectangle is twice as long as it is wide and has a perimeter of 54 meters, what is the area of the rectangle?
| 162 m2 | |
| 32 m2 | |
| 98 m2 | |
| 18 m2 |
The area of a rectangle is width (w) x height (h). In this problem we know that the rectangle is twice as long as it is wide so h = 2w. The perimeter of a rectangle is 2w + 2h and we know that the perimeter of this rectangle is 54 meters so the equation becomes: 2w + 2h = 54.
Putting these two equations together and solving for width (w):
2w + 2h = 54
w + h = \( \frac{54}{2} \)
w + h = 27
w = 27 - h
From the question we know that h = 2w so substituting 2w for h gives us:
w = 27 - 2w
3w = 27
w = \( \frac{27}{3} \)
w = 9
Since h = 2w that makes h = (2 x 9) = 18 and the area = h x w = 9 x 18 = 162 m2
Which of these numbers is a factor of 28?
| 31 | |
| 5 | |
| 14 | |
| 21 |
The factors of a number are all positive integers that divide evenly into the number. The factors of 28 are 1, 2, 4, 7, 14, 28.
If a mayor is elected with 62% of the votes cast and 50% of a town's 44,000 voters cast a vote, how many votes did the mayor receive?
| 13,640 | |
| 15,400 | |
| 12,760 | |
| 12,540 |
If 50% of the town's 44,000 voters cast ballots the number of votes cast is:
(\( \frac{50}{100} \)) x 44,000 = \( \frac{2,200,000}{100} \) = 22,000
The mayor got 62% of the votes cast which is:
(\( \frac{62}{100} \)) x 22,000 = \( \frac{1,364,000}{100} \) = 13,640 votes.
On average, the center for a basketball team hits 45% of his shots while a guard on the same team hits 65% of his shots. If the guard takes 30 shots during a game, how many shots will the center have to take to score as many points as the guard assuming each shot is worth the same number of points?
| 42 | |
| 44 | |
| 61 | |
| 66 |
guard shots made = shots taken x \( \frac{\text{% made}}{100} \) = 30 x \( \frac{65}{100} \) = \( \frac{65 x 30}{100} \) = \( \frac{1950}{100} \) = 19 shots
The center makes 45% of his shots so he'll have to take:
shots made = shots taken x \( \frac{\text{% made}}{100} \)
shots taken = \( \frac{\text{shots taken}}{\frac{\text{% made}}{100}} \)
to make as many shots as the guard. Plugging in values for the center gives us:
center shots taken = \( \frac{19}{\frac{45}{100}} \) = 19 x \( \frac{100}{45} \) = \( \frac{19 x 100}{45} \) = \( \frac{1900}{45} \) = 42 shots
to make the same number of shots as the guard and thus score the same number of points.