| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.79 |
| Score | 0% | 56% |
The dimensions of this trapezoid are a = 4, b = 6, c = 6, d = 8, and h = 3. What is the area?
| 21 | |
| 15 | |
| 30 | |
| 18 |
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(6 + 8)(3)
a = ½(14)(3)
a = ½(42) = \( \frac{42}{2} \)
a = 21
If the length of AB equals the length of BD, point B __________ this line segment.
trisects |
|
intersects |
|
midpoints |
|
bisects |
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.
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
you can add monomials that have the same variable and the same exponent |
|
you can multiply monomials that have different variables and different exponents |
|
you can subtract 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 formula for the area of a circle is which of the following?
a = π r |
|
a = π r2 |
|
a = π d2 |
|
a = π d |
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 -7c - 7c = -9c - 7z - 5 for c in terms of z.
| -\(\frac{3}{14}\)z + \(\frac{1}{2}\) | |
| z - 2\(\frac{1}{2}\) | |
| \(\frac{1}{2}\)z + 1\(\frac{1}{2}\) | |
| -z + 9 |
To solve this equation, isolate the variable for which you are solving (c) on one side of the equation and put everything else on the other side.
-7c - 7z = -9c - 7z - 5
-7c = -9c - 7z - 5 + 7z
-7c + 9c = -7z - 5 + 7z
2c = - 5
c = \( \frac{ - 5}{2} \)
c = \( \frac{}{2} \) + \( \frac{-5}{2} \)
c = z - 2\(\frac{1}{2}\)