| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.79 |
| Score | 0% | 56% |
What is 2a + 9a?
| 11a2 | |
| -7 | |
| 11a | |
| 18a2 |
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.
2a + 9a = 11a
The formula for the area of a circle is which of the following?
c = π r |
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c = π r2 |
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c = π d2 |
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c = π d |
The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)2 : a = π r2.
Simplify (y - 3)(y - 4)
| y2 + y - 12 | |
| y2 + 7y + 12 | |
| y2 - 7y + 12 | |
| y2 - y - 12 |
To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses:
(y - 3)(y - 4)
(y x y) + (y x -4) + (-3 x y) + (-3 x -4)
y2 - 4y - 3y + 12
y2 - 7y + 12
Solve -7c - 3c = -9c + 2x + 7 for c in terms of x.
| 2\(\frac{1}{3}\)x + 3 | |
| -\(\frac{1}{2}\)x - \(\frac{3}{14}\) | |
| 2\(\frac{1}{2}\)x + 3\(\frac{1}{2}\) | |
| -\(\frac{4}{9}\)x + \(\frac{2}{3}\) |
To solve this equation, isolate the variable for which you are solving (c) on one side of the equation and put everything else on the other side.
-7c - 3x = -9c + 2x + 7
-7c = -9c + 2x + 7 + 3x
-7c + 9c = 2x + 7 + 3x
2c = 5x + 7
c = \( \frac{5x + 7}{2} \)
c = \( \frac{5x}{2} \) + \( \frac{7}{2} \)
c = 2\(\frac{1}{2}\)x + 3\(\frac{1}{2}\)
Order the following types of angle from least number of degrees to most number of degrees.
acute, obtuse, right |
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right, acute, obtuse |
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acute, right, obtuse |
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right, obtuse, acute |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.