For water to be a liquid, its temperature must be within 50 Kelvin of 323 Kelvin. Which equation can be used to determine the minimum and maximum temperatures between which water is a liquid?

“Within 50 Kelvin of 323 Kelvin” means the temperature x differs from 323 by at most 50. The absolute difference is written |x − 323|, so setting it equal to 50 gives the two boundary temperatures: 273 K and 373 K. Choice C, |x − 323| = 50, can be used to determine those minimum and maximum temperatures.

AI-written and checked against the verified answer.