there are a couple of problems that are going to be on my final, I was woundering if anyone could help me with these examples..
1.A boy flying a kite holds a string 5 feet above the ground level. The string is payed out at the rate of 2 feet/second as the kite moves horizontally at an altitude of 105 feet. Assuming there is no sag in the string, find the rate at which the kite is moving (horizontally) when 125 feet of string has been payed out.and draw a graph

2. Goven F (x)= 3x to the power of 4 - 4X to the power of 3, find A)the x and Y intercpts, B) The points of max/min and C) the inflection points. Use approiate testsand draw a graph.

3. Using implicit differentiation, find y' given: X to the power of 3 + y to the power of 3=1. Now prove that y"=2x/y to the power of 5

if anyone can help me I would love it.. been trying for a week ont hese questions thnaks anyways