Suppose that the cost of drilling x feet for an oil well is c=f(x) dollars. a) what are the units of f'(x)? b) in practical terms, what does f'(x) mean in this case? c) what can you say about the sign of f'(x)? d)estimate the cost of drilling an additional foot, starting at a depth of 300 ft, given that f'(300)=1000.

this is a very good question

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answer: 2x + 2 − 2 = 10 − 2; subtraction property of equality

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