The water level in a glass decreases 0.4 cm each hour due to evaporation.  At the beginning of the experiment, the water level is 12.6 cm.  Let x represent time, in hours, elapsed since the beginning of the experiment and let y represent the water level, in centimeters.  Part A Construct a linear function, using x and y from above, that determines the water level at a given time, in hours, after the experiment begins. Part B How many hours does it take for all of the water to evaporate?   ____ hours

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.