| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
The formula for volume of a cube in terms of height (h), length (l), and width (w) is which of the following?
2lw x 2wh + 2lh |
|
lw x wh + lh |
|
h x l x w |
|
h2 x l2 x w2 |
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.
What is 4a - 2a?
| 2a2 | |
| 6 | |
| 6a2 | |
| 2a |
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.
4a - 2a = 2a
What is 2a8 - 3a8?
| 5 | |
| -a16 | |
| 5a16 | |
| -1a8 |
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.
2a8 - 3a8 = -1a8
Simplify (5a)(7ab) - (4a2)(8b).
| 3a2b | |
| 67a2b | |
| 144ab2 | |
| 67ab2 |
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.
(5a)(7ab) - (4a2)(8b)
(5 x 7)(a x a x b) - (4 x 8)(a2 x b)
(35)(a1+1 x b) - (32)(a2b)
35a2b - 32a2b
3a2b
What is the circumference of a circle with a diameter of 3?
| 1π | |
| 10π | |
| 20π | |
| 3π |
The formula for circumference is circle diameter x π:
c = πd
c = 3π