Everything else besides Harry seeing his parents is the opportunity cost because those things are what he gave up to go see his parents
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3t+3/5=6
3t = 6-3/5
3t = 27/5
t=9/5
Multiply 25 and 38, the divide that by 34.
the negatives will cancel because there is 1 on the top and 1 on the bottom.
i got 27.9412
4. 6/8, 5. 3 5/8, 6. 7 7/8, 7. 72 months and 2,190 days