| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.39 |
| Score | 0% | 68% |
If BD = 3 and AD = 13, AB = ?
| 18 | |
| 7 | |
| 10 | |
| 1 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BDWhat is the area of a circle with a radius of 3?
| 5π | |
| 36π | |
| 9π | |
| 64π |
The formula for area is πr2:
a = πr2
a = π(32)
a = 9π
Solve for a:
5a + 4 = \( \frac{a}{4} \)
| -1\(\frac{1}{3}\) | |
| -\(\frac{16}{19}\) | |
| 4\(\frac{4}{7}\) | |
| 1\(\frac{1}{17}\) |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
5a + 4 = \( \frac{a}{4} \)
4 x (5a + 4) = a
(4 x 5a) + (4 x 4) = a
20a + 16 = a
20a + 16 - a = 0
20a - a = -16
19a = -16
a = \( \frac{-16}{19} \)
a = -\(\frac{16}{19}\)
What is 5a5 - 8a5?
| -3a5 | |
| 40a5 | |
| -3 | |
| 13a10 |
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.
5a5 - 8a5 = -3a5
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
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 multiply monomials that have different variables and different exponents |
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.