Welcome to PF!
Well the first problem with your post is posting images.
And the second problem with your post is it show two questions and some work done on paper.
Which question are you trying to solve and what page goes with what question?
My suggestion is to follow our homework template and type in what you've got so people can see it more clearly.
We have an advanced input editor that can provide latex support for entering your formulas.
This is probably why no one has responded yet as its hard to point out where you went wrong from an image of your work.