| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.92 |
| Score | 0% | 58% |
What is \( \frac{-4a^5}{2a^2} \)?
| -2a10 | |
| -2a-3 | |
| -\(\frac{1}{2}\)a-3 | |
| -2a3 |
To divide terms with exponents, the base of both exponents must be the same. In this case they are so divide the coefficients and subtract the exponents:
\( \frac{-4a^5}{2a^2} \)
\( \frac{-4}{2} \) a(5 - 2)
-2a3
If \( \left|y - 2\right| \) + 4 = 9, which of these is a possible value for y?
| 20 | |
| 13 | |
| -5 | |
| -3 |
First, solve for \( \left|y - 2\right| \):
\( \left|y - 2\right| \) + 4 = 9
\( \left|y - 2\right| \) = 9 - 4
\( \left|y - 2\right| \) = 5
The value inside the absolute value brackets can be either positive or negative so (y - 2) must equal + 5 or -5 for \( \left|y - 2\right| \) to equal 5:
| y - 2 = 5 y = 5 + 2 y = 7 | y - 2 = -5 y = -5 + 2 y = -3 |
So, y = -3 or y = 7.
If the ratio of home fans to visiting fans in a crowd is 2:1 and all 35,000 seats in a stadium are filled, how many home fans are in attendance?
| 34,400 | |
| 23,333 | |
| 28,667 | |
| 25,833 |
A ratio of 2:1 means that there are 2 home fans for every one visiting fan. So, of every 3 fans, 2 are home fans and \( \frac{2}{3} \) of every fan in the stadium is a home fan:
35,000 fans x \( \frac{2}{3} \) = \( \frac{70000}{3} \) = 23,333 fans.
Roger loaned Alex $1,300 at an annual interest rate of 4%. If no payments are made, what is the interest owed on this loan at the end of the first year?
| $28 | |
| $52 | |
| $135 | |
| $30 |
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 $1,300
i = 0.04 x $1,300
i = $52
If a rectangle is twice as long as it is wide and has a perimeter of 48 meters, what is the area of the rectangle?
| 50 m2 | |
| 128 m2 | |
| 98 m2 | |
| 8 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 48 meters so the equation becomes: 2w + 2h = 48.
Putting these two equations together and solving for width (w):
2w + 2h = 48
w + h = \( \frac{48}{2} \)
w + h = 24
w = 24 - h
From the question we know that h = 2w so substituting 2w for h gives us:
w = 24 - 2w
3w = 24
w = \( \frac{24}{3} \)
w = 8
Since h = 2w that makes h = (2 x 8) = 16 and the area = h x w = 8 x 16 = 128 m2