| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.71 |
| Score | 0% | 74% |
Solve for c:
-7c + 9 < -2 - 8c
| c < 1\(\frac{1}{8}\) | |
| c < -1\(\frac{1}{5}\) | |
| c < -5 | |
| c < -11 |
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.
-7c + 9 < -2 - 8c
-7c < -2 - 8c - 9
-7c + 8c < -2 - 9
c < -11
A right angle measures:
90° |
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360° |
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45° |
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180° |
A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.
Simplify (5a)(9ab) + (5a2)(7b).
| 10ab2 | |
| 168a2b | |
| 80a2b | |
| 10a2b |
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)(9ab) + (5a2)(7b)
(5 x 9)(a x a x b) + (5 x 7)(a2 x b)
(45)(a1+1 x b) + (35)(a2b)
45a2b + 35a2b
80a2b
A quadrilateral is a shape with __________ sides.
4 |
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5 |
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2 |
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3 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
Which of the following statements about math operations is incorrect?
all of these statements are correct |
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you can subtract monomials that have the same variable and the same exponent |
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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 |
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.