The cost of mining a ton of coal is rising faster every year. Suppose 
is the cost of mining a ton of coal at time t. Which of the following must be positive? Select all that apply.
Definitions:
Tort Remedies
Legal solutions provided to victims of torts, including compensation for losses, injunctions, and restitution aimed at rectifying harm.
Contract Remedies
Legal actions or compensation methods available to enforce, rectify, or compensate for the breach of a contract.
Express Agency
A principal-agent relationship formed by explicit written or oral agreement between the agent and the principal.
Implied Authority
Authority of an agent that is not explicitly stated but is deemed necessary to carry out express authority.
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