| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 4.01 |
| Score | 0% | 80% |
What is the area of a circle with a diameter of 4?
| 5π | |
| 4π | |
| 81π | |
| 2π |
The formula for area is πr2. Radius is circle \( \frac{diameter}{2} \):
r = \( \frac{d}{2} \)
r = \( \frac{4}{2} \)
r = 2
a = πr2
a = π(22)
a = 4π
What is 2a - 7a?
| -5a | |
| 9 | |
| 14a | |
| -5 |
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.
2a - 7a = -5a
Simplify 8a x 8b.
| 64\( \frac{b}{a} \) | |
| 64ab | |
| 16ab | |
| 64a2b2 |
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.
8a x 8b = (8 x 8) (a x b) = 64ab
To multiply binomials, use the FOIL method. Which of the following is not a part of the FOIL method?
Inside |
|
First |
|
Last |
|
Odd |
To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses.
The dimensions of this cube are height (h) = 1, length (l) = 4, and width (w) = 7. What is the volume?
| 96 | |
| 128 | |
| 72 | |
| 28 |
The volume of a cube is height x length x width:
v = h x l x w
v = 1 x 4 x 7
v = 28