| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.65 |
| Score | 0% | 53% |
If side x = 11cm, side y = 10cm, and side z = 13cm what is the perimeter of this triangle?
| 28cm | |
| 29cm | |
| 34cm | |
| 32cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 11cm + 10cm + 13cm = 34cm
Which of the following is not required to define the slope-intercept equation for a line?
y-intercept |
|
x-intercept |
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slope |
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\({\Delta y \over \Delta x}\) |
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.
The formula for the area of a circle is which of the following?
c = π d |
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c = π d2 |
|
c = π r |
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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.
When two lines intersect, adjacent angles are __________ (they add up to 180°) and angles across from either other are __________ (they're equal).
supplementary, vertical |
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acute, obtuse |
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vertical, supplementary |
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obtuse, acute |
Angles around a line add up to 180°. Angles around a point add up to 360°. When two lines intersect, adjacent angles are supplementary (they add up to 180°) and angles across from either other are vertical (they're equal).
Simplify (8a)(4ab) - (6a2)(4b).
| -8ab2 | |
| 120a2b | |
| 8a2b | |
| 56a2b |
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.
(8a)(4ab) - (6a2)(4b)
(8 x 4)(a x a x b) - (6 x 4)(a2 x b)
(32)(a1+1 x b) - (24)(a2b)
32a2b - 24a2b
8a2b