| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.99 |
| Score | 0% | 60% |
Solve for a:
8a - 9 = -3 + 2a
| 1 | |
| \(\frac{3}{5}\) | |
| \(\frac{1}{3}\) | |
| -2 |
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.
8a - 9 = -3 + 2a
8a = -3 + 2a + 9
8a - 2a = -3 + 9
6a = 6
a = \( \frac{6}{6} \)
a = 1
If angle a = 37° and angle b = 28° what is the length of angle c?
| 114° | |
| 115° | |
| 105° | |
| 123° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 37° - 28° = 115°
If AD = 30 and BD = 25, AB = ?
| 13 | |
| 12 | |
| 19 | |
| 5 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BDThe formula for the area of a circle is which of the following?
c = π r |
|
c = π r2 |
|
c = π d |
|
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.
What is the area of a circle with a radius of 5?
| 4π | |
| 9π | |
| 25π | |
| 16π |
The formula for area is πr2:
a = πr2
a = π(52)
a = 25π