| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
What is 3a6 - 4a6?
| -1a6 | |
| a612 | |
| 7 | |
| 12a6 |
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.
3a6 - 4a6 = -1a6
Which of the following statements about math operations is incorrect?
you can add monomials that have the same variable and the same exponent |
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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 |
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.
A trapezoid is a quadrilateral with one set of __________ sides.
right angle |
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equal angle |
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equal length |
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parallel |
A trapezoid is a quadrilateral with one set of parallel sides.
Simplify (3a)(5ab) - (2a2)(5b).
| -5ab2 | |
| 25a2b | |
| 5a2b | |
| 25ab2 |
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.
(3a)(5ab) - (2a2)(5b)
(3 x 5)(a x a x b) - (2 x 5)(a2 x b)
(15)(a1+1 x b) - (10)(a2b)
15a2b - 10a2b
5a2b
If angle a = 30° and angle b = 45° what is the length of angle c?
| 95° | |
| 120° | |
| 58° | |
| 105° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 30° - 45° = 105°