The area of the figure i can see is 68.89 cm squared
Use Pi, 3.14. Divide the Diameter by 3.14 and you should get your answer. That's all I know.
I think it is the associative property of Addition
It's simple, you just have to times everything. 5000 x 3.2% x 5 years. After calculating these, 3.2 is as 0.032 so there would be three decimal places. So then it will e 5000 x 0.032 x 5