| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.73 |
| Score | 0% | 75% |
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
exponents |
|
addition |
|
pairs |
|
division |
When solving an equation with two variables, 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.)
What is 2a - 5a?
| 7 | |
| a2 | |
| -3a | |
| -3a2 |
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 - 5a = -3a
The dimensions of this cylinder are height (h) = 1 and radius (r) = 2. What is the surface area?
| 140π | |
| 180π | |
| 252π | |
| 12π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(22) + 2π(2 x 1)
sa = 2π(4) + 2π(2)
sa = (2 x 4)π + (2 x 2)π
sa = 8π + 4π
sa = 12π
The dimensions of this cube are height (h) = 7, length (l) = 4, and width (w) = 4. What is the volume?
| 112 | |
| 648 | |
| 18 | |
| 140 |
The volume of a cube is height x length x width:
v = h x l x w
v = 7 x 4 x 4
v = 112
What is 9a3 + 2a3?
| 11a6 | |
| 11a3 | |
| 7a6 | |
| a36 |
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.
9a3 + 2a3 = 11a3