What in the world is this language talking abaut?
The first thing you should do is use the method of variable separation. Then, integrate both sides to find the solution.
In this case the answer is
<span>D. - 1/y = 3x4/3 + C</span>
I attach the solution
Number 15 is 80 i dont know about the others...sorry
I think you just have to add all of the totals up??