| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.29 |
| Score | 0% | 66% |
What is the circumference of a circle with a diameter of 14?
| 11π | |
| 18π | |
| 16π | |
| 14π |
The formula for circumference is circle diameter x π:
c = πd
c = 14π
If angle a = 39° and angle b = 60° what is the length of angle c?
| 91° | |
| 81° | |
| 121° | |
| 75° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 39° - 60° = 81°
The dimensions of this cube are height (h) = 6, length (l) = 4, and width (w) = 4. What is the surface area?
| 166 | |
| 34 | |
| 128 | |
| 52 |
The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):
sa = 2lw + 2wh + 2lh
sa = (2 x 4 x 4) + (2 x 4 x 6) + (2 x 4 x 6)
sa = (32) + (48) + (48)
sa = 128
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
you can subtract monomials that have the same variable and the same exponent |
|
you can multiply monomials that have different variables and different exponents |
|
you can add 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.
Simplify (7a)(5ab) + (8a2)(9b).
| 107a2b | |
| -37a2b | |
| 37a2b | |
| -37ab2 |
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)(5ab) + (8a2)(9b)
(7 x 5)(a x a x b) + (8 x 9)(a2 x b)
(35)(a1+1 x b) + (72)(a2b)
35a2b + 72a2b
107a2b