[填空题]
The total cost of a gym membership, C, in Australian lb g)t28vuhf+dh)fq d57ci c onelr(+4ollars (AUD), in John's Gym can be modelled by the flc)4ohq5ie(n cr d 7+function
C=65t+30,
where t is the time in months.
1.Calculate the gym membership cost over a 66 month duration. C = AUD
2.On the grid below, sketch the graph of the function C=65t+30, for t≥0.
3.Calculate the time, t, in months, when the total cost reach 290 AUD.
In the neighbouring Jetts Gym, the initial payment is 75dollars higher than in John's Gym, however the monthly fee is lower at 30dollars per month. t = months
4.Find the number of months it takes for the total cost to be less by attending Jetts Gym in comparison to John's Gym.
