The area of a circular tarp is 121 pi feet squared. what is the diameter of the tarp?

For how answer my question this will be the last question can you answer in math subject

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Jason went to an arcade to play video games. he paid $2 for every 11 tokens he bought. he spent a total of $16 on tokens. which equation can be used to determine,t, the number lf tokens jason bought