| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
Simplify (2a)(2ab) + (3a2)(8b).
| 28ab2 | |
| 44a2b | |
| -20a2b | |
| 28a2b |
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.
(2a)(2ab) + (3a2)(8b)
(2 x 2)(a x a x b) + (3 x 8)(a2 x b)
(4)(a1+1 x b) + (24)(a2b)
4a2b + 24a2b
28a2b
What is 7a + 8a?
| -a2 | |
| 56a | |
| 56a2 | |
| 15a |
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.
7a + 8a = 15a
If the base of this triangle is 8 and the height is 1, what is the area?
| 4 | |
| 56 | |
| 82\(\frac{1}{2}\) | |
| 27\(\frac{1}{2}\) |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 8 x 1 = \( \frac{8}{2} \) = 4
The dimensions of this cube are height (h) = 9, length (l) = 7, and width (w) = 7. What is the volume?
| 112 | |
| 441 | |
| 216 | |
| 40 |
The volume of a cube is height x length x width:
v = h x l x w
v = 9 x 7 x 7
v = 441
Which of the following statements about a parallelogram is not true?
a parallelogram is a quadrilateral |
|
the perimeter of a parallelogram is the sum of the lengths of all sides |
|
the area of a parallelogram is base x height |
|
opposite sides and adjacent angles are equal |
A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).