| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
If the base of this triangle is 9 and the height is 7, what is the area?
| 25 | |
| 30 | |
| 75 | |
| 31\(\frac{1}{2}\) |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 9 x 7 = \( \frac{63}{2} \) = 31\(\frac{1}{2}\)
A cylinder with a radius (r) and a height (h) has a surface area of:
2(π r2) + 2π rh |
|
π r2h2 |
|
π r2h |
|
4π r2 |
A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r2h and the surface area is 2(π r2) + 2π rh.
What is 2a - 3a?
| -1 | |
| -a2 | |
| 5a2 | |
| -1a |
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.
2a - 3a = -1a
What is 9a + 9a?
| 18a | |
| 18a2 | |
| 0 | |
| 81a2 |
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.
9a + 9a = 18a
Simplify (4a)(4ab) + (4a2)(5b).
| 36a2b | |
| 4ab2 | |
| -4ab2 | |
| 72a2b |
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.
(4a)(4ab) + (4a2)(5b)
(4 x 4)(a x a x b) + (4 x 5)(a2 x b)
(16)(a1+1 x b) + (20)(a2b)
16a2b + 20a2b
36a2b