| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
Find the value of c:
-3c + y = 7
-c + 2y = 2
| 1\(\frac{3}{7}\) | |
| -20 | |
| -2\(\frac{2}{5}\) |
You need to find the value of c so solve the first equation in terms of y:
-3c + y = 7
y = 7 + 3c
then substitute the result (7 - -3c) into the second equation:
-c + 2(7 + 3c) = 2
-c + (2 x 7) + (2 x 3c) = 2
-c + 14 + 6c = 2
-c + 6c = 2 - 14
5c = -12
c = \( \frac{-12}{5} \)
c = -2\(\frac{2}{5}\)
The formula for the area of a circle is which of the following?
a = π r |
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a = π r2 |
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a = π d |
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a = π d2 |
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.
Which of the following statements about a triangle is not true?
area = ½bh |
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sum of interior angles = 180° |
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perimeter = sum of side lengths |
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exterior angle = sum of two adjacent interior angles |
A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.
A coordinate grid is composed of which of the following?
all of these |
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y-axis |
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origin |
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x-axis |
The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.
On this circle, a line segment connecting point A to point D is called:
chord |
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circumference |
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diameter |
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radius |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).