| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
The dimensions of this cylinder are height (h) = 1 and radius (r) = 8. What is the surface area?
| 44π | |
| 132π | |
| 144π | |
| 60π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(82) + 2π(8 x 1)
sa = 2π(64) + 2π(8)
sa = (2 x 64)π + (2 x 8)π
sa = 128π + 16π
sa = 144π
Which types of triangles will always have at least two sides of equal length?
equilateral, isosceles and right |
|
equilateral and right |
|
isosceles and right |
|
equilateral and isosceles |
An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.
What is 4a4 - 2a4?
| 2a4 | |
| 6 | |
| 2a8 | |
| 8a8 |
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.
4a4 - 2a4 = 2a4
Simplify 7a x 5b.
| 35\( \frac{a}{b} \) | |
| 35ab | |
| 12ab | |
| 35\( \frac{b}{a} \) |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
7a x 5b = (7 x 5) (a x b) = 35ab
If the base of this triangle is 1 and the height is 9, what is the area?
| 71\(\frac{1}{2}\) | |
| 32\(\frac{1}{2}\) | |
| 25 | |
| 4\(\frac{1}{2}\) |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 1 x 9 = \( \frac{9}{2} \) = 4\(\frac{1}{2}\)