| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.03 |
| Score | 0% | 61% |
If a = c = 1, b = d = 9, what is the area of this rectangle?
| 10 | |
| 9 | |
| 8 | |
| 12 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 1 x 9
a = 9
Order the following types of angle from least number of degrees to most number of degrees.
right, obtuse, acute |
|
acute, right, obtuse |
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acute, obtuse, right |
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right, acute, obtuse |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.
The formula for the area of a circle is which of the following?
c = π r |
|
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.
What is 4a9 - 2a9?
| 2 | |
| 2a9 | |
| 2a18 | |
| 6a18 |
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.
4a9 - 2a9 = 2a9
Factor y2 - 11y + 18
| (y + 9)(y - 2) | |
| (y - 9)(y - 2) | |
| (y + 9)(y + 2) | |
| (y - 9)(y + 2) |
To factor a quadratic expression, apply the FOIL method (First, Outside, Inside, Last) in reverse. First, find the two Last terms that will multiply to produce 18 as well and sum (Inside, Outside) to equal -11. For this problem, those two numbers are -9 and -2. Then, plug these into a set of binomials using the square root of the First variable (y2):
y2 - 11y + 18
y2 + (-9 - 2)y + (-9 x -2)
(y - 9)(y - 2)