| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
If a rectangle is twice as long as it is wide and has a perimeter of 30 meters, what is the area of the rectangle?
| 50 m2 | |
| 8 m2 | |
| 128 m2 | |
| 72 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 30 meters so the equation becomes: 2w + 2h = 30.
Putting these two equations together and solving for width (w):
2w + 2h = 30
w + h = \( \frac{30}{2} \)
w + h = 15
w = 15 - h
From the question we know that h = 2w so substituting 2w for h gives us:
w = 15 - 2w
3w = 15
w = \( \frac{15}{3} \)
w = 5
Since h = 2w that makes h = (2 x 5) = 10 and the area = h x w = 5 x 10 = 50 m2
If a mayor is elected with 73% of the votes cast and 57% of a town's 9,000 voters cast a vote, how many votes did the mayor receive?
| 3,745 | |
| 3,899 | |
| 4,617 | |
| 4,155 |
If 57% of the town's 9,000 voters cast ballots the number of votes cast is:
(\( \frac{57}{100} \)) x 9,000 = \( \frac{513,000}{100} \) = 5,130
The mayor got 73% of the votes cast which is:
(\( \frac{73}{100} \)) x 5,130 = \( \frac{374,490}{100} \) = 3,745 votes.
Which of the following is not a prime number?
5 |
|
7 |
|
2 |
|
9 |
A prime number is an integer greater than 1 that has no factors other than 1 and itself. Examples of prime numbers include 2, 3, 5, 7, and 11.
What is 6z3 x 4z2?
| 10z6 | |
| 24z2 | |
| 24z5 | |
| 24z |
To multiply terms with exponents, the base of both exponents must be the same. In this case they are so multiply the coefficients and add the exponents:
6z3 x 4z2
(6 x 4)z(3 + 2)
24z5
If there were a total of 50 raffle tickets sold and you bought 3 tickets, what's the probability that you'll win the raffle?
| 15% | |
| 2% | |
| 17% | |
| 7% |
You have 3 out of the total of 50 raffle tickets sold so you have a (\( \frac{3}{50} \)) x 100 = \( \frac{3 \times 100}{50} \) = \( \frac{300}{50} \) = 7% chance to win the raffle.