| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.61 |
| Score | 0% | 52% |
If a = -1 and y = 7, what is the value of 3a(a - y)?
| 24 | |
| 0 | |
| -60 | |
| 224 |
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.)
3a(a - y)
3(-1)(-1 - 7)
3(-1)(-8)
(-3)(-8)
24
The formula for the area of a circle is which of the following?
c = π d2 |
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c = π d |
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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.
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.
The dimensions of this trapezoid are a = 4, b = 8, c = 6, d = 8, and h = 3. What is the area?
| 22\(\frac{1}{2}\) | |
| 37\(\frac{1}{2}\) | |
| 18 | |
| 24 |
The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height:
a = ½(b + d)(h)
a = ½(8 + 8)(3)
a = ½(16)(3)
a = ½(48) = \( \frac{48}{2} \)
a = 24
If the length of AB equals the length of BD, point B __________ this line segment.
midpoints |
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trisects |
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bisects |
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intersects |
A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.