| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.74 |
| Score | 0% | 55% |
If angle a = 27° and angle b = 34° what is the length of angle c?
| 97° | |
| 119° | |
| 81° | |
| 85° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 27° - 34° = 119°
The formula for the area of a circle is which of the following?
c = π r |
|
c = π r2 |
|
c = π d2 |
|
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.
Simplify (7a)(5ab) - (2a2)(3b).
| 60ab2 | |
| 60a2b | |
| 29a2b | |
| -29ab2 |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
(7a)(5ab) - (2a2)(3b)
(7 x 5)(a x a x b) - (2 x 3)(a2 x b)
(35)(a1+1 x b) - (6)(a2b)
35a2b - 6a2b
29a2b
What is 9a3 + 2a3?
| 7 | |
| 11a3 | |
| a36 | |
| 7a6 |
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.
9a3 + 2a3 = 11a3
Which of the following is not required to define the slope-intercept equation for a line?
y-intercept |
|
slope |
|
\({\Delta y \over \Delta x}\) |
|
x-intercept |
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.