| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
What is the area of a circle with a radius of 3?
| 6π | |
| 9π | |
| 4π | |
| 81π |
The formula for area is πr2:
a = πr2
a = π(32)
a = 9π
Solve for z:
-8z - 2 > \( \frac{z}{4} \)
| z > 3\(\frac{1}{2}\) | |
| z > -1\(\frac{3}{13}\) | |
| z > \(\frac{27}{46}\) | |
| z > -\(\frac{8}{33}\) |
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 > sign and the answer on the other.
-8z - 2 > \( \frac{z}{4} \)
4 x (-8z - 2) > z
(4 x -8z) + (4 x -2) > z
-32z - 8 > z
-32z - 8 - z > 0
-32z - z > 8
-33z > 8
z > \( \frac{8}{-33} \)
z > -\(\frac{8}{33}\)
If angle a = 59° and angle b = 37° what is the length of angle c?
| 106° | |
| 87° | |
| 82° | |
| 84° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 59° - 37° = 84°
What is 9a + 9a?
| 81a | |
| 81a2 | |
| 18a2 | |
| 18a |
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.
9a + 9a = 18a
Which of the following statements about math operations is incorrect?
you can subtract monomials that have the same variable and the same exponent |
|
you can add monomials that have the same variable and the same exponent |
|
all of these statements are correct |
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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.