concentrationn of salt x is given as funcion of time:
dx/dt= 37.5-.35 x

what is the salt concentration after 3 min?

Question

concentrationn of salt x is given as funcion of time:
dx/dt= 37.5-.35 x 

what is the salt concentration after 3 min?

e.mccormick · Answer

So evaluating the derivative at a specific point.  What part is it you do not get?

anonymous · Answer

i jsut dont undertand what i need to do

e.mccormick · Answer

Well, it is the whole momentary aspect of derivatives.  They help find a value at a specific point in time.  I'll see if I can find a good reference.  I got caught up in a matrix qustion at the moment.

e.mccormick · Answer

Are you going over anti-derivatives at this point?  Hmm...  Normally the derivative is the rate of change at a point, not what something is at that point.  So I am wondering if you need to integrate this first.

e.mccormick · Answer

This is either really simple, you need to put 3 in for x and solve, or slightly less simple you need to integrate it and put in 3.  It all depends on where you are in studying math.  Sort of gives a context for the problem.