| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
If angle a = 39° and angle b = 32° what is the length of angle c?
| 101° | |
| 109° | |
| 90° | |
| 133° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 39° - 32° = 109°
The formula for the area of a circle is which of the following?
a = π d2 |
|
a = π r2 |
|
a = π r |
|
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 for a:
-8a - 5 > \( \frac{a}{6} \)
| a > -\(\frac{8}{15}\) | |
| a > -\(\frac{32}{47}\) | |
| a > 1\(\frac{1}{4}\) | |
| a > -\(\frac{30}{49}\) |
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 > sign and the answer on the other.
-8a - 5 > \( \frac{a}{6} \)
6 x (-8a - 5) > a
(6 x -8a) + (6 x -5) > a
-48a - 30 > a
-48a - 30 - a > 0
-48a - a > 30
-49a > 30
a > \( \frac{30}{-49} \)
a > -\(\frac{30}{49}\)
Solve for a:
a - 7 < 1 - 2a
| a < \(\frac{4}{7}\) | |
| a < 2\(\frac{2}{3}\) | |
| a < -1\(\frac{4}{5}\) | |
| a < -\(\frac{1}{5}\) |
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 < sign and the answer on the other.
a - 7 < 1 - 2a
a < 1 - 2a + 7
a + 2a < 1 + 7
3a < 8
a < \( \frac{8}{3} \)
a < 2\(\frac{2}{3}\)
What is 4a7 + 3a7?
| 12a14 | |
| a14 | |
| 7 | |
| 7a7 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
4a7 + 3a7 = 7a7