| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
What is the circumference of a circle with a radius of 9?
| 19π | |
| 18π | |
| 30π | |
| 14π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 9)
c = 18π
Solve for x:
x + 2 > -7 + 3x
| x > -1\(\frac{3}{5}\) | |
| x > 4\(\frac{1}{2}\) | |
| x > 1 | |
| x > -4 |
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.
x + 2 > -7 + 3x
x > -7 + 3x - 2
x - 3x > -7 - 2
-2x > -9
x > \( \frac{-9}{-2} \)
x > 4\(\frac{1}{2}\)
A coordinate grid is composed of which of the following?
all of these |
|
origin |
|
x-axis |
|
y-axis |
The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.
The dimensions of this cylinder are height (h) = 6 and radius (r) = 7. What is the surface area?
| 182π | |
| 306π | |
| 40π | |
| 196π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(72) + 2π(7 x 6)
sa = 2π(49) + 2π(42)
sa = (2 x 49)π + (2 x 42)π
sa = 98π + 84π
sa = 182π
The formula for volume of a cube in terms of height (h), length (l), and width (w) is which of the following?
h x l x w |
|
h2 x l2 x w2 |
|
lw x wh + lh |
|
2lw x 2wh + 2lh |
A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.