What is the temperature in degrees Fahrenheit corresponding to 21 degrees Celsius?

• A. 75.2 °F
• B. 69.8 °F
• C. 32.0 °F
• D. 53.6 °F

Answer: (B)

Verified step by step guidance

1. Recall the formula to convert temperature from Celsius (°C) to Fahrenheit (°F): \(\displaystyle F = \frac{9}{5} C + 32\).
2. Identify the given temperature in Celsius, which is \(21\,^{\circ}\mathrm{C}\).
3. Substitute the Celsius temperature into the formula: \(\displaystyle F = \frac{9}{5} \times 21 + 32\).
4. Perform the multiplication first: calculate \(\frac{9}{5} \times 21\).
5. Add 32 to the result from the previous step to find the temperature in Fahrenheit.