Bob picks up a sandwich from the cafeteria and pays the cashier $3.25. he ate half of it and did not want the rest. what is the cost associated with what you left on the plate?

Sunk cost

Explanation:

When somebody spends some amount of money, no matter what's the use for, if that won't be refunded or recovered later, then the money spent (on 1/2 of the sandwich) it's called Sunk cost.

answer: b) the us is the leading importer but not the leading exporter.

extra info:

the u.s is the largest importer but it is not the largest exporter as china sits on the top of the table when it comes to leading exporters.

but u.s is not far from first,

they rank in 2nd globally as the worlds largest exporter.

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answer; intellectual property protection;