Analyze the following expressions:

Analysis of Expressions:

• 9 мин 24 с: This represents a duration of time, consisting of 9 minutes and 24 seconds.
• 9 м² - 15 дм²: This is a subtraction of two area measurements. 'м²' denotes square meters and 'дм²' denotes square decimeters. To perform the subtraction, a conversion of units would be necessary (e.g., converting square decimeters to square meters or vice versa).
• 3 т - 9 ц: This represents a subtraction of two mass measurements. 'т' denotes metric tons and 'ц' denotes centners (or quintals). Similar to the area measurement, a unit conversion would be required before subtraction.