| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.76 |
| Score | 0% | 75% |
Simplify (8a)(9ab) + (8a2)(5b).
| 32a2b | |
| 221a2b | |
| 32ab2 | |
| 112a2b |
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.
(8a)(9ab) + (8a2)(5b)
(8 x 9)(a x a x b) + (8 x 5)(a2 x b)
(72)(a1+1 x b) + (40)(a2b)
72a2b + 40a2b
112a2b
What is 4a - 5a?
| -1a | |
| 20a | |
| 20a2 | |
| 9 |
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 - 5a = -1a
What is 7a7 - 3a7?
| a714 | |
| 4a7 | |
| 4 | |
| 10a14 |
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.
7a7 - 3a7 = 4a7
If a = 8, b = 7, c = 9, and d = 6, what is the perimeter of this quadrilateral?
| 15 | |
| 27 | |
| 30 | |
| 26 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 8 + 7 + 9 + 6
p = 30
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 |
|
2lw x 2wh + 2lh |
|
lw x wh + lh |
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.