Oil and gas production in a certain area dropped from 4 million barrels in 2000 to 1.9 million barrels in 2013. Assuming that the oil and gas production decreased at a constant rate, which of the following linear functions f best models the production in millions of barrels, t years after year 2000?
A. F(t) = 21/30t+4
B. F(t) = 19/130t+4
C. F(t)= -21/30t+4
D. F(t) = -19/130t+4
EXPLAIN WHICH ONE & WHY

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