Question

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?

Answer 1

well water is liquid between 0 and 100 degree (273 ,373)
you can use an equation that contains absolute value 
/x-a/<b
a-b<x<a+b
/x-323/<50

Answer 2

Answer:

$\left | x-323 \right |<50$

Step-by-step explanation:

For water to be in the liquid state, the temperature must be within 50 kelvin (K) of 323 K.

So the range of the temperature of water will lie between 50 kelvin more than 323 kelvin and 50 kelvin less than 323.

The equation that can be used to determine the maximum temperature at which water is a liquid can be given by:

$x<323+50$

The equation that can be used to determine the minimum temperature at which water is a liquid can be given by:

$x>323-50$

So in a combined form it can be written as:

$\left | x-323 \right |<50$