An unknown radioactive element decays into non-radioactive substances. In 700 days the radioactivity of a sample decreases by 67 percent. (a) What is the half-life of the element? half-life:    (days) (b) How long will it take for a sample of 100mg to decay to 70 mg? the time needed:    (days)

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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.