I'm having a little trouble with finding the derivative of this one. The fraction with the square root is giving me the trouble, I'm not sure if I should be using the quotient rule or the chain rule or the chain rule within the quotient rule.

Anyone able to clarify this for me?

Thanks

David

\(\displaystyle y=60-\frac{x}{5}+ \frac{\sqrt{100^2+x^2}}{3}\)