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I have posted a link there to this topic so the OP can see my work.Related Rates and Implicit Differentiation Question? Please help!?

What is y'' (second derivative) of:

x^(1/2) + y^(1/2) = 1 ?

Find all points on the curve x^2*y^2 + x*y = 2 where the slope of the tangent line is -1.

At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/hr and ship is sailing north at 25 km/hr. How fast is the distance between the ships changing at 4:00 PM?

A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 5 ft/s along a straight path. How fast is the tip of his shadow moving when is 40 ft from the pole?

Thank you for your help.