| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.73 |
| Score | 0% | 55% |
A tiger in a zoo has consumed 60 pounds of food in 6 days. If the tiger continues to eat at the same rate, in how many more days will its total food consumtion be 100 pounds?
| 8 | |
| 3 | |
| 4 | |
| 2 |
If the tiger has consumed 60 pounds of food in 6 days that's \( \frac{60}{6} \) = 10 pounds of food per day. The tiger needs to consume 100 - 60 = 40 more pounds of food to reach 100 pounds total. At 10 pounds of food per day that's \( \frac{40}{10} \) = 4 more days.
If \( \left|b - 5\right| \) + 3 = -8, which of these is a possible value for b?
| 16 | |
| 9 | |
| 12 | |
| 4 |
First, solve for \( \left|b - 5\right| \):
\( \left|b - 5\right| \) + 3 = -8
\( \left|b - 5\right| \) = -8 - 3
\( \left|b - 5\right| \) = -11
The value inside the absolute value brackets can be either positive or negative so (b - 5) must equal - 11 or --11 for \( \left|b - 5\right| \) to equal -11:
| b - 5 = -11 b = -11 + 5 b = -6 | b - 5 = 11 b = 11 + 5 b = 16 |
So, b = 16 or b = -6.
If a rectangle is twice as long as it is wide and has a perimeter of 12 meters, what is the area of the rectangle?
| 18 m2 | |
| 98 m2 | |
| 8 m2 | |
| 162 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 12 meters so the equation becomes: 2w + 2h = 12.
Putting these two equations together and solving for width (w):
2w + 2h = 12
w + h = \( \frac{12}{2} \)
w + h = 6
w = 6 - h
From the question we know that h = 2w so substituting 2w for h gives us:
w = 6 - 2w
3w = 6
w = \( \frac{6}{3} \)
w = 2
Since h = 2w that makes h = (2 x 2) = 4 and the area = h x w = 2 x 4 = 8 m2
A triathlon course includes a 400m swim, a 40.1km bike ride, and a 12.3km run. What is the total length of the race course?
| 52.8km | |
| 32.4km | |
| 51km | |
| 61.9km |
To add these distances, they must share the same unit so first you need to first convert the swim distance from meters (m) to kilometers (km) before adding it to the bike and run distances which are already in km. To convert 400 meters to kilometers, divide the distance by 1000 to get 0.4km then add the remaining distances:
total distance = swim + bike + run
total distance = 0.4km + 40.1km + 12.3km
total distance = 52.8km
What is \( 3 \)\( \sqrt{45} \) - \( 7 \)\( \sqrt{5} \)
| -4\( \sqrt{45} \) | |
| 21\( \sqrt{45} \) | |
| 21\( \sqrt{225} \) | |
| 2\( \sqrt{5} \) |
To subtract these radicals together their radicands must be the same:
3\( \sqrt{45} \) - 7\( \sqrt{5} \)
3\( \sqrt{9 \times 5} \) - 7\( \sqrt{5} \)
3\( \sqrt{3^2 \times 5} \) - 7\( \sqrt{5} \)
(3)(3)\( \sqrt{5} \) - 7\( \sqrt{5} \)
9\( \sqrt{5} \) - 7\( \sqrt{5} \)
Now that the radicands are identical, you can subtract them:
9\( \sqrt{5} \) - 7\( \sqrt{5} \)