Help me study for my test tomorrow!

Tomorrow's my test and there are a few concepts that I have to work on.

1. Sketch the region bounded by the graphs of the equations, and determine its area.

Answer: A=16

My main problem with this is getting rid of the from under so I can begin to integrate.

2. Find the particular solution of the differential equation whose graph passes through the point (2,1) and is tangent to the line at that point.

I already found that and . What now? I don't get what the question is asking me.

3. Use the Second Fundamental Theorem of Calculus to find .

F(x)=(integration sign, x between 0 and x)

Answer=

I know that is the antiderivative of the inside of the integration symbol, but I don't understand how to find .

Some help on these questions would greatly be appreciated.