| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
What is the circumference of a circle with a diameter of 10?
| 34π | |
| 9π | |
| 7π | |
| 10π |
The formula for circumference is circle diameter x π:
c = πd
c = 10π
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
you can multiply monomials that have different variables and different exponents |
|
you can subtract monomials that have the same variable and the same exponent |
|
you can add monomials that have the same variable and the same exponent |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.
If b = 8 and z = 4, what is the value of -3b(b - z)?
| -96 | |
| 4 | |
| -576 | |
| 504 |
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.)
-3b(b - z)
-3(8)(8 - 4)
-3(8)(4)
(-24)(4)
-96
What is 5a7 - 3a7?
| 8a14 | |
| 2 | |
| a714 | |
| 2a7 |
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.
5a7 - 3a7 = 2a7
If AD = 28 and BD = 23, AB = ?
| 5 | |
| 3 | |
| 16 | |
| 2 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BD