| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
A quadrilateral is a shape with __________ sides.
4 |
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3 |
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5 |
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2 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
When two lines intersect, adjacent angles are __________ (they add up to 180°) and angles across from either other are __________ (they're equal).
supplementary, vertical |
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vertical, supplementary |
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acute, obtuse |
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obtuse, acute |
Angles around a line add up to 180°. Angles around a point add up to 360°. When two lines intersect, adjacent angles are supplementary (they add up to 180°) and angles across from either other are vertical (they're equal).
Solve 8a - 2a = -6a - 3z + 4 for a in terms of z.
| -\(\frac{1}{14}\)z + \(\frac{2}{7}\) | |
| -\(\frac{2}{15}\)z - \(\frac{2}{5}\) | |
| 1\(\frac{2}{5}\)z + 1\(\frac{1}{5}\) | |
| -\(\frac{2}{5}\)z - \(\frac{1}{2}\) |
To solve this equation, isolate the variable for which you are solving (a) on one side of the equation and put everything else on the other side.
8a - 2z = -6a - 3z + 4
8a = -6a - 3z + 4 + 2z
8a + 6a = -3z + 4 + 2z
14a = -z + 4
a = \( \frac{-z + 4}{14} \)
a = \( \frac{-z}{14} \) + \( \frac{4}{14} \)
a = -\(\frac{1}{14}\)z + \(\frac{2}{7}\)
What is the circumference of a circle with a diameter of 1?
| 12π | |
| 13π | |
| 6π | |
| 1π |
The formula for circumference is circle diameter x π:
c = πd
c = 1π
What is 8a - 7a?
| 15 | |
| 1a | |
| 56a2 | |
| 56a |
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.
8a - 7a = 1a