SOLUTION: c=30t+20 90=30t+20 70=30t t=2 1/3 Cost for 7 month c=20+(30x7) c=20+210 c=$230

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Question 270217: c=30t+20
90=30t+20
70=30t
t=2 1/3
Cost for 7 month
c=20+(30x7)
c=20+210
c=$230
Answer by stickkens(2) About Me  (Show Source):