Plan A costs $40 for each visit.
Plan B costs $120 initially, then costs $10 for each visit.
a) Write an equation for plan A, relating the price P (in $) in terms of v (the number of visits).
b) Write an equation for plan B, relating P and v.
c) How many visits until the cost of plan B equals plan A?
d) If you will visit 5 times each month, which plan should you choose?