Practice Evaluating Expressions in One Variable
| Site: | Saylor Academy |
| Course: | MA007: Algebra |
| Book: | Practice Evaluating Expressions in One Variable |
| Printed by: | Guest user |
| Date: | Tuesday, 15 July 2025, 7:46 AM |
Description
buttons.Practice Problems
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Evaluate \(c-2\) when \(c = 7\).
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Evaluate \(9 - \frac{8}{S}\) when \(S = 4\).
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Evaluate \(\frac{n}{6} + 2\) when \(n = 12\).
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Evaluate \(6h\) when \(h = 8\).
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Evaluate \(6+x\) when \(x = 3\).
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Evaluate \(\frac{9}{m} + 4\) when \(m = 3\).
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Evaluate \(\frac{p}{2} -5\) when \(p = 14\).
Source: Khan Academy, https://www.khanacademy.org/math/in-seventh-grade-math/algebraic-expressions/finding-value-expression/e/evaluating_expressions_1
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.
Answers
1. Evaluate \( c - 2 \) when \( c = 7 \)
Substitute \( c = 7 \) into the expression:
\( c - 2 = 7 - 2 \)
Compute the subtraction:
\( 7 - 2 = 5 \)
Answer: \( 5 \)
2. Evaluate \( 9 - \frac{8}{S} \) when \( S = 4 \)
Substitute \( S = 4 \):
\( 9 - \frac{8}{S} = 9 - \frac{8}{4} \)
Compute the division:
\( \frac{8}{4} = 2 \)
Subtract:
\( 9 - 2 = 7 \)
Answer: \( 7 \)
3. Evaluate \( \frac{n}{6} + 2 \) when \( n = 12 \)
Substitute \( n = 12 \):
\( \frac{n}{6} + 2 = \frac{12}{6} + 2 \)
Divide:
\( \frac{12}{6} = 2 \)
Add:
\( 2 + 2 = 4 \)
Answer: \( 4 \)
4. Evaluate \( 6h \) when \( h = 8 \)
Substitute \( h = 8 \):
\( 6h = 6 \times 8 \)
Multiply:
\( 6 \times 8 = 48 \)
Answer: \( 48 \)
5. Evaluate \( 6 + x \) when \( x = 3 \)
Substitute \( x = 3 \):
\( 6 + x = 6 + 3 \)
Add:
\( 6 + 3 = 9 \)
Answer: \( 9 \)
6. Evaluate \( \frac{9}{m} + 4 \) when \( m = 3 \)
Substitute \( m = 3 \):
\( \frac{9}{m} + 4 = \frac{9}{3} + 4 \)
Divide:
\( \frac{9}{3} = 3 \)
Add:
\( 3 + 4 = 7 \)
Answer: \( 7 \)
7. Evaluate \( \frac{p}{2} - 5 \) when \( p = 14 \)
Substitute \( p = 14 \):
\( \frac{p}{2} - 5 = \frac{14}{2} - 5 \)
Divide:
\( \frac{14}{2} = 7 \)
Subtract:
\( 7 - 5 = 2 \)
Answer: \( 2 \)