| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.55 |
| Score | 0% | 71% |
Find the value of a:
6a + y = -2
-7a - 2y = 4
| -3\(\frac{5}{13}\) | |
| -1\(\frac{1}{14}\) | |
| -\(\frac{8}{9}\) |
You need to find the value of a so solve the first equation in terms of y:
6a + y = -2
y = -2 - 6a
then substitute the result (-2 - 6a) into the second equation:
-7a - 2(-2 - 6a) = 4
-7a + (-2 x -2) + (-2 x -6a) = 4
-7a + 4 + 12a = 4
-7a + 12a = 4 - 4
5a = 0
a = \( \frac{0}{5} \)
a =
What is the circumference of a circle with a diameter of 9?
| 16π | |
| 2π | |
| 9π | |
| 4π |
The formula for circumference is circle diameter x π:
c = πd
c = 9π
Order the following types of angle from least number of degrees to most number of degrees.
right, acute, obtuse |
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acute, right, obtuse |
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acute, obtuse, right |
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right, obtuse, acute |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
exponents |
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division |
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addition |
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pairs |
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.)
If AD = 28 and BD = 24, AB = ?
| 15 | |
| 5 | |
| 4 | |
| 12 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BD