| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.13 |
| Score | 0% | 63% |
What is the area of a circle with a radius of 5?
| 25π | |
| 4π | |
| 6π | |
| 9π |
The formula for area is πr2:
a = πr2
a = π(52)
a = 25π
Simplify (y + 6)(y - 8)
| y2 + 2y - 48 | |
| y2 + 14y + 48 | |
| y2 - 2y - 48 | |
| y2 - 14y + 48 |
To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses:
(y + 6)(y - 8)
(y x y) + (y x -8) + (6 x y) + (6 x -8)
y2 - 8y + 6y - 48
y2 - 2y - 48
A(n) __________ is to a parallelogram as a square is to a rectangle.
rhombus |
|
trapezoid |
|
quadrilateral |
|
triangle |
A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.
What is 7a3 - 4a3?
| 3 | |
| 3a3 | |
| 28a6 | |
| 3a6 |
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.
7a3 - 4a3 = 3a3
A cylinder with a radius (r) and a height (h) has a surface area of:
π r2h |
|
2(π r2) + 2π rh |
|
4π r2 |
|
π r2h2 |
A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r2h and the surface area is 2(π r2) + 2π rh.