General

3. Use FOIL.
6. Find the area of the rectangle and the area of the circle, and take the difference of the two.
7. This is asking you to interpret the graph that shows the object [b]stopping[/b] after a certain amount of time. What does it mean when an object stops?
14. Use your trig rules to find the distance.
16. Review your exponent rules.
19. What does it mean if there are infinitely many solutions? It means the lines overlap each other.
20. A solution to two graphs means it exists on both lines.

I'm sure other basilers will give you the answers anways but w/e

(x+y)^2=x^2-2xy+y^2 , expand the second term and simplify
Area of a circle= pi x r^2
Area of a rectangle= length x width
Shaded area is the difference of the area of the rectangle, and the circle.
When the distance line doesn't increase/decrease, the motion has stopped.