$11.49 for 3 packages. round to the nearest hundredth if necessary

How to do this , and can some one explain

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83