Question 230 of 480
Simplify 31/2 - (21/3 * 11/4) + 3/5
- A. 211/60
- B. 21/60
- C. 111/60
- D. 11/60
Correct Answer:
C
Explanation
To simplify the expression \( 3^{1/2} - (2^{1/3} \times 1^{1/4}) + \frac{3}{5} \), we will break it down step by step.
### Step 1: Calculate \( 3^{1/2} \)
The term \( 3^{1/2} \) represents the square root of 3.
\[
3^{1/2} = \sqrt{3} \approx 1.732
\]
### Step 2: Calculate \( 2^{1/3} \)
The term \( 2^{1/3} \) represents the cube root of 2.
\[
2^{1/3} \approx 1.2599
\]
### Step 3: Calculate \( 1^{1/4} \)
The term \( 1^{1/4} \) represents the fourth root of 1, which is simply 1.
\[
1^{1/4} = 1
\]
### Step 4: Calculate \( 2^{1/3} \times 1^{1/4} \)
Now we multiply the results from Step 2 and Step 3:
\[
2^{1/3} \times 1^{1/4} = 1.2599 \times 1 = 1.2599
\]
### Step 5: Substitute back into the expression
Now we substitute back into the original expression:
\[
3^{1/2} - (2^{1/3} \times 1^{1/4}) + \frac{3}{5}
\]
This becomes:
\[
\sqrt{3} - 1.2599 + \frac{3}{5}
\]
### Step 6: Convert \( \frac{3}{5} \) to a decimal
The fraction \( \frac{3}{5} \) can be converted to a decimal:
\[
\frac{3}{5} = 0.6
\]
### Step 7: Combine all terms
Now we can combine all the terms:
\[
1.732 - 1.2599 + 0.6
\]
Calculating this step-by-step:
1. \( 1.732 - 1.2599 \approx 0.4721 \)
2. \( 0.4721 + 0.6 \approx 1.0721 \)
### Step 8: Convert to a fraction
To express \( 1.0721 \) as a fraction, we can convert it to a fraction with a common denominator.
1. The decimal \( 1.0721 \) can be approximated as \( \frac{10721}{10000} \), but we want to express it in terms of the options given.
2. We can also express \( 1.0721 \) as \( \frac{11}{10} \) (which is \( 1.1 \)) and convert it to a fraction with a denominator of 60.
### Step 9: Find a common denominator
To express \( 1.0721 \) in terms of 60, we can convert \( 1.0721 \) to a fraction:
\[
1.0721 \approx \frac{11}{10} \approx \frac{66}{60}
\]
### Final Calculation
Now we can see that the closest option to our calculated value is:
\[
\frac{211}{60} \text{ (which is approximately } 3.5167\text{)}
\]
### Conclusion
The correct answer is **A. \( \frac{211}{60} \)**.
### Why Other Options Are Incorrect
- **B. \( \frac{21}{60} \)**: This is too small and does not reflect the calculations we performed.
- **C. \( \frac{111}{60} \)**: This is also too small and does not match our calculations.
- **D. \( \frac{11}{60} \)**: This is significantly smaller than our calculated value.
### Revision Summary
- Calculate roots and products carefully.
- Convert fractions to decimals and vice versa as needed.
- Combine terms step-by-step, ensuring to maintain accuracy.
- Always check your final answer against the options provided.