| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.06 |
| Score | 0% | 61% |
The formula for the area of a circle is which of the following?
a = π r2 |
|
a = π d2 |
|
a = π d |
|
a = π r |
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.
Which of the following statements about math operations is incorrect?
all of these statements are correct |
|
you can add monomials that have the same variable and the same exponent |
|
you can subtract monomials that have the same variable and the same exponent |
|
you can multiply monomials that have different variables and different exponents |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.
If angle a = 53° and angle b = 31° what is the length of angle c?
| 96° | |
| 84° | |
| 76° | |
| 66° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 53° - 31° = 96°
If the length of AB equals the length of BD, point B __________ this line segment.
midpoints |
|
intersects |
|
bisects |
|
trisects |
A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.
Find the value of c:
7c + y = 2
-2c - 3y = 2
| -\(\frac{11}{15}\) | |
| -2\(\frac{7}{9}\) | |
| -3 | |
| \(\frac{8}{19}\) |
You need to find the value of c so solve the first equation in terms of y:
7c + y = 2
y = 2 - 7c
then substitute the result (2 - 7c) into the second equation:
-2c - 3(2 - 7c) = 2
-2c + (-3 x 2) + (-3 x -7c) = 2
-2c - 6 + 21c = 2
-2c + 21c = 2 + 6
19c = 8
c = \( \frac{8}{19} \)
c = \(\frac{8}{19}\)