



 
Hi Lisa. I've drawn the situation below. What you are trying to find is dx/dt when x = 500 m. You are given Recall that tan = x / 2000, so x = 2000 tan Take the derivative of both sides with respect to time and you get: dx/dt = 2000 d/dt (tan ) Can you use the chain rule and solve the rest of the problem? You'll need to substitute the appropriate value of when x = 500, which you can find by using the Pythagorean theorem. Hope this helps,
 


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 