Questions asked by Abigail

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• The coordination of a particle in the xy-plane are differentiable functions of t with dx/dt=-1m/sec and dy/dt=-5m/sec. How fast is particle's distance form the origin changing as it pass through the point(5,12)? I desperately need help with these problem
  
• Find any extrema of the function #f(x,y)=e^{-xy/4}# subject to the constraint #x^2 + y^2 <=1# ? I desperately need help with these problems as I do not understand them. Thanks!