| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.32 |
| Score | 0% | 66% |
Which types of triangles will always have at least two sides of equal length?
equilateral, isosceles and right |
|
isosceles and right |
|
equilateral 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.
What is 9a - 2a?
| 7a2 | |
| 7a | |
| a2 | |
| 11a2 |
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 - 2a = 7a
Simplify (7a)(4ab) + (4a2)(4b).
| -12ab2 | |
| 12ab2 | |
| 44a2b | |
| 12a2b |
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.
(7a)(4ab) + (4a2)(4b)
(7 x 4)(a x a x b) + (4 x 4)(a2 x b)
(28)(a1+1 x b) + (16)(a2b)
28a2b + 16a2b
44a2b
What is the circumference of a circle with a radius of 12?
| 7π | |
| 14π | |
| 24π | |
| 4π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 12)
c = 24π
Simplify (7a)(9ab) - (6a2)(8b).
| 15a2b | |
| -15ab2 | |
| 111ab2 | |
| 224ab2 |
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.
(7a)(9ab) - (6a2)(8b)
(7 x 9)(a x a x b) - (6 x 8)(a2 x b)
(63)(a1+1 x b) - (48)(a2b)
63a2b - 48a2b
15a2b