| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
The formula for the area of a circle is which of the following?
c = π d2 |
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c = π r |
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c = π d |
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c = π r2 |
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.
If a = c = 2, b = d = 4, what is the area of this rectangle?
| 7 | |
| 5 | |
| 8 | |
| 24 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 2 x 4
a = 8
Simplify 5a x 9b.
| 45\( \frac{a}{b} \) | |
| 45\( \frac{b}{a} \) | |
| 45ab | |
| 45a2b2 |
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 9b = (5 x 9) (a x b) = 45ab
A trapezoid is a quadrilateral with one set of __________ sides.
right angle |
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parallel |
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equal length |
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equal angle |
A trapezoid is a quadrilateral with one set of parallel sides.
The endpoints of this line segment are at (-2, 8) and (2, 0). What is the slope-intercept equation for this line?
| y = -2\(\frac{1}{2}\)x + 0 | |
| y = \(\frac{1}{2}\)x + 0 | |
| y = x + 4 | |
| y = -2x + 4 |
The slope-intercept equation for a line is y = mx + b where m is the slope and b is the y-intercept of the line. From the graph, you can see that the y-intercept (the y-value from the point where the line crosses the y-axis) is 4. 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, 8) and (2, 0) so the slope becomes:
m = \( \frac{\Delta y}{\Delta x} \) = \( \frac{(0.0) - (8.0)}{(2) - (-2)} \) = \( \frac{-8}{4} \)Plugging these values into the slope-intercept equation:
y = -2x + 4