| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.78 |
| Score | 0% | 76% |
If a = 5, b = 7, c = 4, and d = 2, what is the perimeter of this quadrilateral?
| 18 | |
| 12 | |
| 26 | |
| 27 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 5 + 7 + 4 + 2
p = 18
What is 4a2 + 5a2?
| 9a4 | |
| a24 | |
| 20a4 | |
| 9a2 |
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.
4a2 + 5a2 = 9a2
The dimensions of this cylinder are height (h) = 4 and radius (r) = 6. What is the surface area?
| 120π | |
| 16π | |
| 12π | |
| 110π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(62) + 2π(6 x 4)
sa = 2π(36) + 2π(24)
sa = (2 x 36)π + (2 x 24)π
sa = 72π + 48π
sa = 120π
A quadrilateral is a shape with __________ sides.
3 |
|
5 |
|
4 |
|
2 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
What is 7a4 - 3a4?
| 4a4 | |
| 10a8 | |
| 21a8 | |
| 10 |
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.
7a4 - 3a4 = 4a4