Question 349978
Let t = cost of one tape.



Since "a cd cost $ 3.50 more than a tape", this means that a cd costs {{{t+3.5}}} dollars. 



Add up these two costs to get {{{t+t+3.5=2t+3.5}}}



So the total cost of a cd and a tape is {{{2t+3.5}}} dollars.



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