Step-by-step explanation: The formula for the circumference of a circle is the diameter multiplied by pi. Since the diameter is 14 and it is telling us to use 3.142 as pi, we can multiply the two and get the answer.
The equation would be 651=58x+129. Subtract 129 from both sides of the equation. you get 522=58x. Then divide both sides of the equation by 58 to get x alone and you get 9=x. The membership is 9 months. Hope I helped and if you have any questions, just leave a comment.