| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
4! = ?
4 x 3 x 2 x 1 |
|
4 x 3 |
|
5 x 4 x 3 x 2 x 1 |
|
3 x 2 x 1 |
A factorial has the form n! and is the product of the integer (n) and all the positive integers below it. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.
If a rectangle is twice as long as it is wide and has a perimeter of 24 meters, what is the area of the rectangle?
| 50 m2 | |
| 32 m2 | |
| 128 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 24 meters so the equation becomes: 2w + 2h = 24.
Putting these two equations together and solving for width (w):
2w + 2h = 24
w + h = \( \frac{24}{2} \)
w + h = 12
w = 12 - h
From the question we know that h = 2w so substituting 2w for h gives us:
w = 12 - 2w
3w = 12
w = \( \frac{12}{3} \)
w = 4
Since h = 2w that makes h = (2 x 4) = 8 and the area = h x w = 4 x 8 = 32 m2
What is (y5)4?
| 4y5 | |
| y | |
| 5y4 | |
| y20 |
To raise a term with an exponent to another exponent, retain the base and multiply the exponents:
(y5)4If a mayor is elected with 58% of the votes cast and 77% of a town's 17,000 voters cast a vote, how many votes did the mayor receive?
| 8,116 | |
| 10,210 | |
| 7,592 | |
| 11,257 |
If 77% of the town's 17,000 voters cast ballots the number of votes cast is:
(\( \frac{77}{100} \)) x 17,000 = \( \frac{1,309,000}{100} \) = 13,090
The mayor got 58% of the votes cast which is:
(\( \frac{58}{100} \)) x 13,090 = \( \frac{759,220}{100} \) = 7,592 votes.
Solve for \( \frac{5!}{2!} \)
| 20 | |
| \( \frac{1}{20} \) | |
| \( \frac{1}{30} \) | |
| 60 |
A factorial is the product of an integer and all the positive integers below it. To solve a fraction featuring factorials, expand the factorials and cancel out like numbers:
\( \frac{5!}{2!} \)
\( \frac{5 \times 4 \times 3 \times 2 \times 1}{2 \times 1} \)
\( \frac{5 \times 4 \times 3}{1} \)
\( 5 \times 4 \times 3 \)
60