| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
Order the following types of angle from least number of degrees to most number of degrees.
right, obtuse, acute |
|
acute, obtuse, right |
|
right, acute, obtuse |
|
acute, right, obtuse |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.
What is 8a - 5a?
| 13 | |
| 3a | |
| 3a2 | |
| 40a2 |
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 - 5a = 3a
A quadrilateral is a shape with __________ sides.
4 |
|
3 |
|
5 |
|
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).
vertical, supplementary |
|
obtuse, acute |
|
acute, obtuse |
|
supplementary, vertical |
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 for c:
-4c + 2 = \( \frac{c}{9} \)
| -\(\frac{9}{14}\) | |
| \(\frac{24}{55}\) | |
| \(\frac{18}{37}\) | |
| -\(\frac{28}{55}\) |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
-4c + 2 = \( \frac{c}{9} \)
9 x (-4c + 2) = c
(9 x -4c) + (9 x 2) = c
-36c + 18 = c
-36c + 18 - c = 0
-36c - c = -18
-37c = -18
c = \( \frac{-18}{-37} \)
c = \(\frac{18}{37}\)