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The temperature outside is 40 degrees Celsius. What is this in degrees Fahrenheit?

A. 4.4 degrees Fahrenheit
B. 100 degrees Fahrenheit
C. 130 degrees Fahrenheit
D. 104 degrees Fahrenheit
E. 78 degrees Fahrenheit

Answer :

- The problem requires converting Celsius to Fahrenheit.
- The conversion formula is: $F =
\frac{9}{5}C + 32$.
- Substitute $C = 40$ into the formula: $F =
\frac{9}{5}(40) + 32$.
- Calculate the Fahrenheit temperature: $F = 104$. The final answer is $\boxed{104}$

### Explanation
1. Understanding the Problem
We are given a temperature of 40 degrees Celsius and asked to convert it to degrees Fahrenheit. To do this, we will use the standard formula for converting Celsius to Fahrenheit.

2. Recalling the Conversion Formula
The formula to convert Celsius (\[C\]) to Fahrenheit (\[F\]) is:
\[F = \frac{9}{5}C + 32\]

3. Substituting the Value
Now, we substitute the given Celsius temperature, \[C = 40\] degrees, into the formula:
\[F = \frac{9}{5}(40) + 32\]

4. Calculating Fahrenheit
Next, we perform the calculation:
\[F = \frac{9 \times 40}{5} + 32\]
\[F = \frac{360}{5} + 32\]
\[F = 72 + 32\]
\[F = 104\]

5. Final Answer
Therefore, 40 degrees Celsius is equal to 104 degrees Fahrenheit.

### Examples
Temperature conversion is a common task in many real-world scenarios. For example, when traveling to a country that uses a different temperature scale, you need to convert temperatures to understand the weather. Also, many scientific and engineering applications require temperature conversions to ensure accurate measurements and calculations. Knowing how to convert between Celsius and Fahrenheit can be very useful in daily life and various professional fields.

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