| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.65 |
| Score | 0% | 53% |
If angle a = 20° and angle b = 32° what is the length of angle c?
| 50° | |
| 128° | |
| 88° | |
| 98° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 20° - 32° = 128°
Solve for a:
4a + 4 > 8 - 4a
| a > -2\(\frac{1}{2}\) | |
| a > \(\frac{1}{2}\) | |
| a > 1 | |
| a > -\(\frac{3}{8}\) |
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.
4a + 4 > 8 - 4a
4a > 8 - 4a - 4
4a + 4a > 8 - 4
8a > 4
a > \( \frac{4}{8} \)
a > \(\frac{1}{2}\)
What is 7a6 - 4a6?
| 3 | |
| 3a12 | |
| 11 | |
| 3a6 |
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.
7a6 - 4a6 = 3a6
Which of the following is not required to define the slope-intercept equation for a line?
slope |
|
y-intercept |
|
x-intercept |
|
\({\Delta y \over \Delta x}\) |
A line on the coordinate grid can be defined by a slope-intercept equation: y = mx + b. For a given value of x, the value of y can be determined given the slope (m) and y-intercept (b) of the line. The slope of a line is change in y over change in x, \({\Delta y \over \Delta x}\), and the y-intercept is the y-coordinate where the line crosses the vertical y-axis.
The formula for the area of a circle is which of the following?
c = π d2 |
|
c = π r |
|
c = π r2 |
|
c = 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.