| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.74 |
| Score | 0% | 75% |
What is the area of a circle with a radius of 2?
| 64π | |
| 4π | |
| 5π | |
| 9π |
The formula for area is πr2:
a = πr2
a = π(22)
a = 4π
What is 7a + 7a?
| 2 | |
| 14a | |
| a2 | |
| 14 |
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.
7a + 7a = 14a
If a = 8, b = 1, c = 2, and d = 6, what is the perimeter of this quadrilateral?
| 15 | |
| 17 | |
| 16 | |
| 23 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 8 + 1 + 2 + 6
p = 17
Which of the following is not true about both rectangles and squares?
the lengths of all sides are equal |
|
the area is length x width |
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the perimeter is the sum of the lengths of all four sides |
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all interior angles are right angles |
A rectangle is a parallelogram containing four right angles. Opposite sides (a = c, b = d) are equal and the perimeter is the sum of the lengths of all sides (a + b + c + d) or, comonly, 2 x length x width. The area of a rectangle is length x width. A square is a rectangle with four equal length sides. The perimeter of a square is 4 x length of one side (4s) and the area is the length of one side squared (s2).
Breaking apart a quadratic expression into a pair of binomials is called:
deconstructing |
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normalizing |
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factoring |
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squaring |
To factor a quadratic expression, apply the FOIL (First, Outside, Inside, Last) method in reverse.