| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.54 |
| Score | 0% | 71% |
What is 8a7 - 7a7?
| 1a7 | |
| 15a14 | |
| a14 | |
| 15 |
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.
8a7 - 7a7 = 1a7
What is the area of a circle with a radius of 4?
| 16π | |
| 64π | |
| 81π | |
| 3π |
The formula for area is πr2:
a = πr2
a = π(42)
a = 16π
Simplify (6a)(8ab) + (8a2)(2b).
| 64a2b | |
| 140ab2 | |
| -32a2b | |
| 32ab2 |
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.
(6a)(8ab) + (8a2)(2b)
(6 x 8)(a x a x b) + (8 x 2)(a2 x b)
(48)(a1+1 x b) + (16)(a2b)
48a2b + 16a2b
64a2b
If the base of this triangle is 9 and the height is 8, what is the area?
| 56 | |
| 27\(\frac{1}{2}\) | |
| 36 | |
| 35 |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 9 x 8 = \( \frac{72}{2} \) = 36
If a = 8, b = 3, c = 2, and d = 1, what is the perimeter of this quadrilateral?
| 21 | |
| 17 | |
| 18 | |
| 14 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 8 + 3 + 2 + 1
p = 14