| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
What is 5a8 + 3a8?
| 15a8 | |
| 2 | |
| 8a8 | |
| 2a16 |
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.
5a8 + 3a8 = 8a8
The formula for the area of a circle is which of the following?
c = π r |
|
c = π d2 |
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c = π r2 |
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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.
A trapezoid is a quadrilateral with one set of __________ sides.
equal angle |
|
right angle |
|
parallel |
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equal length |
A trapezoid is a quadrilateral with one set of parallel sides.
The endpoints of this line segment are at (-2, -1) and (2, 1). What is the slope of this line?
| \(\frac{1}{2}\) | |
| 1 | |
| 3 | |
| 2\(\frac{1}{2}\) |
The slope of this line is the change in y divided by the change in x. The endpoints of this line segment are at (-2, -1) and (2, 1) so the slope becomes:
m = \( \frac{\Delta y}{\Delta x} \) = \( \frac{(1.0) - (-1.0)}{(2) - (-2)} \) = \( \frac{2}{4} \)A right angle measures:
45° |
|
90° |
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180° |
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360° |
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.