| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
The dimensions of this cylinder are height (h) = 9 and radius (r) = 2. What is the surface area?
| 42π | |
| 80π | |
| 44π | |
| 10π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(22) + 2π(2 x 9)
sa = 2π(4) + 2π(18)
sa = (2 x 4)π + (2 x 18)π
sa = 8π + 36π
sa = 44π
Which of the following statements about math operations is incorrect?
you can multiply monomials that have different variables and different exponents |
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all of these statements are correct |
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you can add monomials that have the same variable and the same exponent |
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you can subtract monomials that have the same variable and the same exponent |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.
If BD = 10 and AD = 15, AB = ?
| 3 | |
| 18 | |
| 2 | |
| 5 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BDThe dimensions of this cube are height (h) = 2, length (l) = 7, and width (w) = 8. What is the volume?
| 120 | |
| 48 | |
| 504 | |
| 112 |
The volume of a cube is height x length x width:
v = h x l x w
v = 2 x 7 x 8
v = 112
On this circle, line segment AB is the:
chord |
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diameter |
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circumference |
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radius |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).