| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.57 |
| Score | 0% | 71% |
What is the area of a circle with a radius of 4?
| 2π | |
| 16π | |
| 36π | |
| 7π |
The formula for area is πr2:
a = πr2
a = π(42)
a = 16π
A(n) __________ is two expressions separated by an equal sign.
formula |
|
equation |
|
expression |
|
problem |
An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
Which types of triangles will always have at least two sides of equal length?
equilateral, isosceles and right |
|
equilateral and isosceles |
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isosceles and right |
|
equilateral and right |
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 2a5 + 7a5?
| 9a5 | |
| a510 | |
| 9a10 | |
| 14a5 |
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.
2a5 + 7a5 = 9a5
What is 5a - 9a?
| -4a2 | |
| -4a | |
| 14a2 | |
| a2 |
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.
5a - 9a = -4a