Pls help math problem pls

Draw a scaled copy of the circle using a scale factor of 2

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

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