Final answer:
To convert 28°F to Celsius, we use the conversion formula and round to two significant figures, resulting in -2.2°C.
Step-by-step explanation:
The question asks us to convert a temperature from Fahrenheit (°F) to Celsius (°C) while rounding to the correct number of significant figures. To convert 28°F to °C, we use the conversion formula: T°C = (T°F - 32) × 5/9. Plugging in the values, we get T°C = (28 - 32) × 5/9 = (-4) × 5/9, which equals -2.22°C. Since we want to round to the correct number of significant figures, the answer should be -2.2°C because the original temperature, 28°F, has two significant figures.