| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
What is 2a + 2a?
| 4 | |
| 4a | |
| a2 | |
| 4a2 |
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.
2a + 2a = 4a
If a = c = 3, b = d = 9, and the blue angle = 72°, what is the area of this parallelogram?
| 56 | |
| 20 | |
| 27 | |
| 42 |
The area of a parallelogram is equal to its length x width:
a = l x w
a = a x b
a = 3 x 9
a = 27
Solve -9c + 3c = 4c + 9z - 7 for c in terms of z.
| \(\frac{4}{13}\)z - \(\frac{1}{13}\) | |
| -\(\frac{6}{13}\)z + \(\frac{7}{13}\) | |
| -3\(\frac{3}{4}\)z - 1\(\frac{1}{4}\) | |
| \(\frac{1}{7}\)z + 1\(\frac{2}{7}\) |
To solve this equation, isolate the variable for which you are solving (c) on one side of the equation and put everything else on the other side.
-9c + 3z = 4c + 9z - 7
-9c = 4c + 9z - 7 - 3z
-9c - 4c = 9z - 7 - 3z
-13c = 6z - 7
c = \( \frac{6z - 7}{-13} \)
c = \( \frac{6z}{-13} \) + \( \frac{-7}{-13} \)
c = -\(\frac{6}{13}\)z + \(\frac{7}{13}\)
If a = c = 5, b = d = 6, what is the area of this rectangle?
| 28 | |
| 30 | |
| 4 | |
| 36 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 5 x 6
a = 30
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
you can multiply monomials that have different variables and different exponents |
|
you can add monomials that have the same variable and the same exponent |
|
you can subtract monomials that have the same variable and the same exponent |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.