The​ half-life of the radioactive element unobtainium-47 is 20 seconds. If 80 grams of unobtainium-47 are initially present, how many grams are present after 20 secounds? 40 seconds? 60 seconds? 80 seconds? 100 seconds?   The amount left after 20 seconds is ____ grams.

Q: Which problem would you use to find the value of csc 47 ? 1 0.7071 1 0.7314 0.6820 1 1.0724

A: We find value of csc 47 . We know that the trigonometry ratio-  Sinx = 1/cscx .

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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.