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The Cost of Mining a Ton of Coal Is Rising

Question 76

Multiple Choice

The cost of mining a ton of coal is rising faster every year. Suppose 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. A) B) C) is the cost of mining a ton of coal at time t. Which of the following must be positive? Select all that apply.


A) 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. A) B) C)
B) 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. A) B) C)
C) 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. A) B) C)

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