| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.38 |
| Score | 0% | 68% |
What is 9a - 9a?
| 81a2 | |
| 2 | |
| 0a | |
| 81a |
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.
9a - 9a = 0a
The dimensions of this cylinder are height (h) = 9 and radius (r) = 4. What is the volume?
| 144π | |
| 12π | |
| 36π | |
| 45π |
The volume of a cylinder is πr2h:
v = πr2h
v = π(42 x 9)
v = 144π
Which of the following is not required to define the slope-intercept equation for a line?
slope |
|
\({\Delta y \over \Delta x}\) |
|
x-intercept |
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y-intercept |
A line on the coordinate grid can be defined by a slope-intercept equation: y = mx + b. For a given value of x, the value of y can be determined given the slope (m) and y-intercept (b) of the line. The slope of a line is change in y over change in x, \({\Delta y \over \Delta x}\), and the y-intercept is the y-coordinate where the line crosses the vertical y-axis.
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
division |
|
addition |
|
exponents |
|
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.)
Simplify (6a)(9ab) + (5a2)(7b).
| 19a2b | |
| 89a2b | |
| 19ab2 | |
| 89ab2 |
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.
(6a)(9ab) + (5a2)(7b)
(6 x 9)(a x a x b) + (5 x 7)(a2 x b)
(54)(a1+1 x b) + (35)(a2b)
54a2b + 35a2b
89a2b