| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.80 |
| Score | 0% | 56% |
If a = c = 7, b = d = 1, and the blue angle = 64°, what is the area of this parallelogram?
| 7 | |
| 40 | |
| 28 | |
| 8 |
The area of a parallelogram is equal to its length x width:
a = l x w
a = a x b
a = 7 x 1
a = 7
The formula for the area of a circle is which of the following?
c = π d2 |
|
c = π r |
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c = π d |
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c = π r2 |
The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)2 : a = π r2.
What is 2a7 - 8a7?
| a714 | |
| -6a14 | |
| 10a14 | |
| -6a7 |
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.
2a7 - 8a7 = -6a7
A(n) __________ is two expressions separated by an equal sign.
equation |
|
expression |
|
formula |
|
problem |
An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
Which of the following is not required to define the slope-intercept equation for a line?
\({\Delta y \over \Delta x}\) |
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y-intercept |
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x-intercept |
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slope |
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.