| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
Solve for b:
b2 + 2b - 48 = 0
| 9 or -3 | |
| 7 or -1 | |
| 6 or -8 | |
| -1 or -4 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
b2 + 2b - 48 = 0
(b - 6)(b + 8) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (b - 6) or (b + 8) must equal zero:
If (b - 6) = 0, b must equal 6
If (b + 8) = 0, b must equal -8
So the solution is that b = 6 or -8
What is the circumference of a circle with a diameter of 12?
| 38π | |
| 24π | |
| 8π | |
| 12π |
The formula for circumference is circle diameter x π:
c = πd
c = 12π
A trapezoid is a quadrilateral with one set of __________ sides.
equal length |
|
parallel |
|
equal angle |
|
right angle |
A trapezoid is a quadrilateral with one set of parallel sides.
What is 2a - 7a?
| 9 | |
| 14a | |
| 14a2 | |
| -5a |
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.
2a - 7a = -5a
If side x = 12cm, side y = 10cm, and side z = 10cm what is the perimeter of this triangle?
| 26cm | |
| 24cm | |
| 32cm | |
| 35cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 12cm + 10cm + 10cm = 32cm