| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
A(n) __________ is two expressions separated by an equal sign.
problem |
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formula |
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equation |
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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.
Solve for c:
5c - 6 = 8 - 7c
| 1\(\frac{1}{6}\) | |
| -\(\frac{6}{7}\) | |
| -\(\frac{1}{2}\) | |
| -1 |
To solve this equation, 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.
5c - 6 = 8 - 7c
5c = 8 - 7c + 6
5c + 7c = 8 + 6
12c = 14
c = \( \frac{14}{12} \)
c = 1\(\frac{1}{6}\)
If AD = 12 and BD = 4, AB = ?
| 6 | |
| 11 | |
| 16 | |
| 8 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BDWhat is 3a + 5a?
| a2 | |
| 8a | |
| 8a2 | |
| 15a |
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.
3a + 5a = 8a
A cylinder with a radius (r) and a height (h) has a surface area of:
π r2h |
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π r2h2 |
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2(π r2) + 2π rh |
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4π r2 |
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.