| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.61 |
| Score | 0% | 72% |
If a = 5, b = 5, c = 7, and d = 3, what is the perimeter of this quadrilateral?
| 19 | |
| 23 | |
| 11 | |
| 20 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 5 + 5 + 7 + 3
p = 20
A(n) __________ is two expressions separated by an equal sign.
equation |
|
expression |
|
formula |
|
problem |
An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
A trapezoid is a quadrilateral with one set of __________ sides.
equal length |
|
right angle |
|
parallel |
|
equal angle |
A trapezoid is a quadrilateral with one set of parallel sides.
What is 9a - 2a?
| 11 | |
| 7a2 | |
| a2 | |
| 7a |
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.
9a - 2a = 7a
The dimensions of this cylinder are height (h) = 9 and radius (r) = 9. What is the surface area?
| 54π | |
| 180π | |
| 160π | |
| 324π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(92) + 2π(9 x 9)
sa = 2π(81) + 2π(81)
sa = (2 x 81)π + (2 x 81)π
sa = 162π + 162π
sa = 324π