| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.15 |
| Score | 0% | 63% |
A right angle measures:
90° |
|
180° |
|
45° |
|
360° |
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.
Solve for z:
z2 - 49 = 0
| 7 or -7 | |
| 6 or 6 | |
| 5 or -5 | |
| 4 or -3 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
z2 - 49 = 0
(z - 7)(z + 7) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (z - 7) or (z + 7) must equal zero:
If (z - 7) = 0, z must equal 7
If (z + 7) = 0, z must equal -7
So the solution is that z = 7 or -7
The formula for volume of a cube in terms of height (h), length (l), and width (w) is which of the following?
h x l x w |
|
2lw x 2wh + 2lh |
|
h2 x l2 x w2 |
|
lw x wh + lh |
A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.
The formula for the area of a circle is which of the following?
c = π d2 |
|
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.
If AD = 24 and BD = 23, AB = ?
| 10 | |
| 4 | |
| 5 | |
| 1 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BD