| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
A quadrilateral is a shape with __________ sides.
4 |
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2 |
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5 |
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3 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
Which of the following statements about a parallelogram is not true?
the perimeter of a parallelogram is the sum of the lengths of all sides |
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the area of a parallelogram is base x height |
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a parallelogram is a quadrilateral |
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opposite sides and adjacent angles are equal |
A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).
What is 7a2 + 8a2?
| 56a2 | |
| 15a2 | |
| 15a4 | |
| a24 |
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.
7a2 + 8a2 = 15a2
Simplify (y - 9)(y - 7)
| y2 + 16y + 63 | |
| y2 + 2y - 63 | |
| y2 - 2y - 63 | |
| y2 - 16y + 63 |
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 - 9)(y - 7)
(y x y) + (y x -7) + (-9 x y) + (-9 x -7)
y2 - 7y - 9y + 63
y2 - 16y + 63
If a = c = 4, b = d = 8, what is the area of this rectangle?
| 72 | |
| 32 | |
| 56 | |
| 21 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 4 x 8
a = 32