| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.72 |
| Score | 0% | 74% |
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
division |
|
pairs |
|
exponents |
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addition |
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 the circumference of a circle with a diameter of 4?
| 12π | |
| 16π | |
| 24π | |
| 4π |
The formula for circumference is circle diameter x π:
c = πd
c = 4π
A right angle measures:
45° |
|
90° |
|
360° |
|
180° |
A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.
What is 4a + 2a?
| 6a | |
| 6a2 | |
| 6 | |
| 8a |
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.
4a + 2a = 6a
Solve -3b - 5b = 4b + 3x - 1 for b in terms of x.
| 1\(\frac{2}{11}\)x - \(\frac{6}{11}\) | |
| 1\(\frac{1}{8}\)x - \(\frac{1}{8}\) | |
| -1\(\frac{1}{7}\)x + \(\frac{1}{7}\) | |
| x + \(\frac{1}{2}\) |
To solve this equation, isolate the variable for which you are solving (b) on one side of the equation and put everything else on the other side.
-3b - 5x = 4b + 3x - 1
-3b = 4b + 3x - 1 + 5x
-3b - 4b = 3x - 1 + 5x
-7b = 8x - 1
b = \( \frac{8x - 1}{-7} \)
b = \( \frac{8x}{-7} \) + \( \frac{-1}{-7} \)
b = -1\(\frac{1}{7}\)x + \(\frac{1}{7}\)