| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.02 |
| Score | 0% | 60% |
The formula for the area of a circle is which of the following?
c = π r |
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c = π d |
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c = π r2 |
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c = 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.
Solve for y:
7y - 2 = 7 - y
| 1\(\frac{1}{8}\) | |
| -\(\frac{4}{9}\) | |
| -\(\frac{2}{3}\) | |
| 1\(\frac{1}{5}\) |
To solve this equation, 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.
7y - 2 = 7 - y
7y = 7 - y + 2
7y + y = 7 + 2
8y = 9
y = \( \frac{9}{8} \)
y = 1\(\frac{1}{8}\)
A right angle measures:
45° |
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90° |
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360° |
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180° |
A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.
If the base of this triangle is 1 and the height is 7, what is the area?
| 60\(\frac{1}{2}\) | |
| 84 | |
| 3\(\frac{1}{2}\) | |
| 60 |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 1 x 7 = \( \frac{7}{2} \) = 3\(\frac{1}{2}\)
Which of the following statements about math operations is incorrect?
all of these statements are correct |
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you can subtract monomials that have the same variable and the same exponent |
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you can multiply monomials that have different variables and different exponents |
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you can add monomials that have the same variable and the same exponent |
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.