What is the formula for finding the radius of a circle?

What could explain what happened when the time was equal to 120 minutes

For each proportion find the unknown number x 1/5/8=×/15

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