| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
Simplify (y - 7)(y + 4)
| y2 - 11y + 28 | |
| y2 - 3y - 28 | |
| y2 + 11y + 28 | |
| y2 + 3y - 28 |
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 - 7)(y + 4)
(y x y) + (y x 4) + (-7 x y) + (-7 x 4)
y2 + 4y - 7y - 28
y2 - 3y - 28
The dimensions of this cylinder are height (h) = 1 and radius (r) = 7. What is the volume?
| 256π | |
| 16π | |
| 147π | |
| 49π |
The volume of a cylinder is πr2h:
v = πr2h
v = π(72 x 1)
v = 49π
The formula for the area of a circle is which of the following?
c = π d |
|
c = π r2 |
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c = π d2 |
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c = 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.
If AD = 24 and BD = 16, AB = ?
| 9 | |
| 8 | |
| 2 | |
| 18 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BDA(n) __________ is two expressions separated by an equal sign.
equation |
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formula |
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problem |
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expression |
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.