| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.29 |
| Score | 0% | 66% |
What is 4a9 + 3a9?
| 12a18 | |
| 7a9 | |
| 7 | |
| 1 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
4a9 + 3a9 = 7a9
What is 5a - 5a?
| a2 | |
| 25a2 | |
| 0a | |
| 10 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
5a - 5a = 0a
The endpoints of this line segment are at (-2, -2) and (2, -6). What is the slope of this line?
| 2 | |
| -2\(\frac{1}{2}\) | |
| -1 | |
| -1\(\frac{1}{2}\) |
The slope of this line is the change in y divided by the change in x. The endpoints of this line segment are at (-2, -2) and (2, -6) so the slope becomes:
m = \( \frac{\Delta y}{\Delta x} \) = \( \frac{(-6.0) - (-2.0)}{(2) - (-2)} \) = \( \frac{-4}{4} \)Solve for c:
c2 - 12c + 32 = 0
| 4 or 8 | |
| 7 or -1 | |
| 8 or 2 | |
| -4 or -6 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
c2 - 12c + 32 = 0
(c - 4)(c - 8) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (c - 4) or (c - 8) must equal zero:
If (c - 4) = 0, c must equal 4
If (c - 8) = 0, c must equal 8
So the solution is that c = 4 or 8
What is 3a2 - 3a2?
| 4 | |
| 0a2 | |
| 6 | |
| a24 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
3a2 - 3a2 = 0a2