| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
What is the area of a circle with a radius of 3?
| 9π | |
| 16π | |
| 3π | |
| 25π |
The formula for area is πr2:
a = πr2
a = π(32)
a = 9π
What is 3a2 + 9a2?
| -6a4 | |
| 27a2 | |
| 12a2 | |
| 12a4 |
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.
3a2 + 9a2 = 12a2
A cylinder with a radius (r) and a height (h) has a surface area of:
4π r2 |
|
π r2h2 |
|
2(π r2) + 2π rh |
|
π r2h |
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.
A(n) __________ is two expressions separated by an equal sign.
equation |
|
formula |
|
problem |
|
expression |
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.
If c = -3 and y = -5, what is the value of 4c(c - y)?
| 10 | |
| -24 | |
| 30 | |
| -54 |
To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
4c(c - y)
4(-3)(-3 + 5)
4(-3)(2)
(-12)(2)
-24