Final answer:
Without specific context, it's unclear what X represents in the equations provided, making it hard to choose the best one for its determination. Unit conversions and the addition of time are straightforward arithmetic operations. Identifying linear equations and dealing with significant figures in addition and subtraction require understanding of the underlying mathematical principles.
Step-by-step explanation:
The question appears to be asking for the correct equation to determine the value of X. However, without additional context, it is difficult to determine what X represents in the provided options (A, B, C, D). The equations seem to involve basic arithmetic but are not tied to any clear mathematical principle that would define what X is (e.g., sum of angles in a polygon, algebraic equation, etc.).
When converting units such as seconds to minutes or hours to minutes, the process involves division by 60 for seconds to minutes (since there are 60 seconds in a minute) and multiplication by 60 for hours to minutes (as there are 60 minutes in an hour). For example, 120 seconds is equal to 2 minutes and 4 hours is equal to 240 minutes. Addition of time units requires adding seconds to seconds, minutes to minutes, etc. For instance, 1 hour 55 minutes plus 45 minutes equals 1 hour 100 minutes, which may require further simplification.
Linear equations are typified by the form y = mx + b, where m and b are constants, and both the equations A (y = -3x) and B (y = 0.2 + 0.74x) are examples of linear equations.
When adding or subtracting numbers, especially in scientific contexts, considerations for significant figures are important. For example, an answer involving addition that is until the tenths place should be rounded accordingly if the inputs have varying decimal places.