Student and Vendor Problem

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A conversation bet. a student (S) and a vendor (V): Student: Can I buy 3x-5 where x=6 of chips? Vendor: That's 13, right? That would be 5 sin90 per pack. S: I don't know what it means. Can you convert it through arc tangent? V: I only know tangents. That would be 5 tan45. Just use the reduction formula. S: Ok. Here's my money. The quotient of x (pi squared)-4x+3 and sin 3x where x=7. Keep the change. How much did the student give to the vendor?