2nd Post for vacation

Here is my 2nd post for the holidays and im loving the holidays but only have a week left so im a little bummed.


1st: Related RAtes

1. Identify all variables and equations2. identify what you are looking for3. make a sketch and label4.write an equation involving your variables5. take the derivative with respect to time6. substitute in derivative and solveEx: The variable x and y are differentiable functions of t and are related by the equation

y=2x^3-x+4 when x=2 (dy/dt)=-1

Find (dy/dt) when x=2
(dy/dt)=6x^2
(dy/dt)-(dy/dt)=6(2)^2(-1)-(-1)
(dy/dt)=-23

Another problem i have and still have is Angle of elevation i don't know where my problem is i think its just starting the problem thats really hard for me so if someone can help with that thanks.