A student is taking courses at a local college as a prerequisite to get into a university program they are interested in.  Their school uses a 4.0 GPA scale, meaning the highest possible GPA is 4.0.  The average GPA for applicants accepted into their program of interest is 3.44. This student has already completed 3 semesters of their college program, with each semester consisting of 5 credits for a total weight of 15 credits.  Their GPA over these 15 credits is 3.36.  If they take a fourth semester with an additional 5 credits, what GPA must they obtain in their courses for the fourth semester (only the fourth semester) in order to bring their total GPA for all 20 credits across all four semesters up to 3.44?

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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.