Jenny, Brad, and Heather all have Gym Memberships. There Gym Membership fees are described below, where x represents months: Jenny: 20x+100 Brad: 40x Heather: 2(10x+55) a) At what month will Jenny and Brad pay the same amount for their gym membership? b) Heather stated that her and Jenny will always pay the same amount each moth for their gym membership. Do you agree? Explain your answer.