| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.14 |
| Score | 0% | 63% |
Solve for x:
x2 + 8x + 7 = 0
| 8 or 5 | |
| 5 or 5 | |
| 8 or -4 | |
| -1 or -7 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
x2 + 8x + 7 = 0
(x + 1)(x + 7) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (x + 1) or (x + 7) must equal zero:
If (x + 1) = 0, x must equal -1
If (x + 7) = 0, x must equal -7
So the solution is that x = -1 or -7
A quadrilateral is a shape with __________ sides.
4 |
|
2 |
|
5 |
|
3 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
Which of the following statements about a parallelogram is not true?
the perimeter of a parallelogram is the sum of the lengths of all sides |
|
opposite sides and adjacent angles are equal |
|
a parallelogram is a quadrilateral |
|
the area of a parallelogram is base x height |
A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).
What is the circumference of a circle with a diameter of 19?
| 2π | |
| 19π | |
| 8π | |
| 32π |
The formula for circumference is circle diameter x π:
c = πd
c = 19π
On this circle, line segment CD is the:
circumference |
|
radius |
|
diameter |
|
chord |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).