How much interest would be earned on $20 at 5% for 3 years?

I'm confused on this could anyone me and show me what i need to do to solve it.

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π

What is the equation of a line passing through (-6,5) and having a slope of 1/3