| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.10 |
| Score | 0% | 62% |
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?
| 2 m2 | |
| 32 m2 | |
| 98 m2 | |
| 128 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
Latoya scored 96% on her final exam. If each question was worth 4 points and there were 400 possible points on the exam, how many questions did Latoya answer correctly?
| 98 | |
| 96 | |
| 81 | |
| 85 |
Latoya scored 96% on the test meaning she earned 96% of the possible points on the test. There were 400 possible points on the test so she earned 400 x 0.96 = 384 points. Each question is worth 4 points so she got \( \frac{384}{4} \) = 96 questions right.
The __________ is the greatest factor that divides two integers.
greatest common factor |
|
least common multiple |
|
absolute value |
|
greatest common multiple |
The greatest common factor (GCF) is the greatest factor that divides two integers.
Roger loaned Christine $400 at an annual interest rate of 7%. If no payments are made, what is the total amount owed at the end of the first year?
| $436 | |
| $432 | |
| $428 | |
| $408 |
The yearly interest charged on this loan is the annual interest rate multiplied by the amount borrowed:
interest = annual interest rate x loan amount
i = (\( \frac{6}{100} \)) x $400
i = 0.07 x $400
No payments were made so the total amount due is the original amount + the accumulated interest:
total = $400 + $28Convert z-2 to remove the negative exponent.
| \( \frac{-2}{-z} \) | |
| \( \frac{1}{z^2} \) | |
| \( \frac{-1}{z^{-2}} \) | |
| \( \frac{2}{z} \) |
To convert a negative exponent to a positive exponent, calculate the positive exponent then take the reciprocal.