| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.60 |
| Score | 0% | 72% |
What is 2a9 + 6a9?
| 8 | |
| -4a18 | |
| 8a9 | |
| 12a18 |
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.
2a9 + 6a9 = 8a9
Solve for x:
-5x - 3 < -5 - 6x
| x < -\(\frac{1}{3}\) | |
| x < -2\(\frac{1}{3}\) | |
| x < 1\(\frac{2}{3}\) | |
| x < -2 |
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 < sign and the answer on the other.
-5x - 3 < -5 - 6x
-5x < -5 - 6x + 3
-5x + 6x < -5 + 3
x < -2
A quadrilateral is a shape with __________ sides.
2 |
|
5 |
|
4 |
|
3 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
A cylinder with a radius (r) and a height (h) has a surface area of:
π r2h |
|
4π r2 |
|
2(π r2) + 2π rh |
|
π r2h2 |
A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r2h and the surface area is 2(π r2) + 2π rh.
If a = 3, b = 3, c = 7, and d = 5, what is the perimeter of this quadrilateral?
| 28 | |
| 18 | |
| 16 | |
| 9 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 3 + 3 + 7 + 5
p = 18