| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
Simplify 5a x 8b.
| 40\( \frac{b}{a} \) | |
| 40\( \frac{a}{b} \) | |
| 40a2b2 | |
| 40ab |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
5a x 8b = (5 x 8) (a x b) = 40ab
If angle a = 67° and angle b = 38° what is the length of angle c?
| 117° | |
| 58° | |
| 51° | |
| 75° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 67° - 38° = 75°
Find the value of b:
-2b + z = -3
6b + 2z = -6
| \(\frac{3}{8}\) | |
| \(\frac{4}{69}\) | |
| 1\(\frac{1}{4}\) |
You need to find the value of b so solve the first equation in terms of z:
-2b + z = -3
z = -3 + 2b
then substitute the result (-3 - -2b) into the second equation:
6b + 2(-3 + 2b) = -6
6b + (2 x -3) + (2 x 2b) = -6
6b - 6 + 4b = -6
6b + 4b = -6 + 6
10b = 0
b = \( \frac{0}{10} \)
b =
Order the following types of angle from least number of degrees to most number of degrees.
right, acute, obtuse |
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acute, obtuse, right |
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right, obtuse, acute |
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acute, right, obtuse |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.
Which of the following statements about math operations is incorrect?
you can multiply monomials that have different variables and different exponents |
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you can subtract monomials that have the same variable and the same exponent |
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all of these statements are correct |
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you can add 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.