| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
Which of the following statements about math operations is incorrect?
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 |
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all of these statements are correct |
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you can multiply monomials that have different variables and different exponents |
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 a = 4, b = 7, c = 6, and d = 3, what is the perimeter of this quadrilateral?
| 16 | |
| 24 | |
| 20 | |
| 12 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 4 + 7 + 6 + 3
p = 20
If a = c = 1, b = d = 2, what is the area of this rectangle?
| 12 | |
| 18 | |
| 4 | |
| 2 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 1 x 2
a = 2
Which of the following is not required to define the slope-intercept equation for a line?
\({\Delta y \over \Delta x}\) |
|
y-intercept |
|
slope |
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x-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.
If c = -7 and y = 4, what is the value of 9c(c - y)?
| 693 | |
| 0 | |
| 240 | |
| -54 |
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.)
9c(c - y)
9(-7)(-7 - 4)
9(-7)(-11)
(-63)(-11)
693