| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.59 |
| Score | 0% | 72% |
What is the circumference of a circle with a diameter of 6?
| 20π | |
| 8π | |
| 1π | |
| 6π |
The formula for circumference is circle diameter x π:
c = πd
c = 6π
If a = 2, b = 2, c = 6, and d = 4, what is the perimeter of this quadrilateral?
| 22 | |
| 14 | |
| 18 | |
| 13 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 2 + 2 + 6 + 4
p = 14
Simplify (3a)(5ab) + (9a2)(8b).
| 136ab2 | |
| 136a2b | |
| 87ab2 | |
| 87a2b |
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.
(3a)(5ab) + (9a2)(8b)
(3 x 5)(a x a x b) + (9 x 8)(a2 x b)
(15)(a1+1 x b) + (72)(a2b)
15a2b + 72a2b
87a2b
What is 9a - 5a?
| 4 | |
| 45a2 | |
| 4a | |
| 45a |
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 - 5a = 4a
Which types of triangles will always have at least two sides of equal length?
equilateral and right |
|
equilateral, isosceles and right |
|
isosceles and right |
|
equilateral and isosceles |
An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.