Simple related rates problem.

http://gyazo.com/8203b2b974fbdefff34224fb051b7fbb

the answer i got was 68.9. could somebody do this problem so i can see if i got it right or wrong?

Question

Simple related rates problem.

http://gyazo.com/8203b2b974fbdefff34224fb051b7fbb

the answer i got was 68.9. could somebody do this problem so i can see if i got it right or wrong?

cruffo · Answer

I got something close, but different.

anonymous · Answer

oh. what did you get?

anonymous · Answer

and is it possible for you to post your work on here as well?

cruffo · Answer

:) How 'bout this...  what equation did you take the implicit derivative of to start?

anonymous · Answer

x^2+y^2=z^2

anonymous · Answer

2x(dx/dt)+2x(dy/dy)=2z(dz/dt). plug in values, solve for (dz/dt)

anonymous · Answer

the 2nd is suppost to be 2y

cruffo · Answer

:)  got it
what values do you have?
x = 
y = 
z = 
dx/dt = 
dy/dt =

anonymous · Answer

x=50, y=120 z=122.57  dx/dt=25  dy/dt=60

cruffo · Answer

Ah.. there's the difference.  I got z = 130

anonymous · Answer

yeah, your right. just made a small mistake, thanks for the help.

cruffo · Answer

np.  Cool