Mashaal Masha
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 the year 2000?
Difficulty: Hard
A: 

$f(t)=\frac{21}{130}\,t+4$

B: 

$f(t)=\frac{19}{130}\,t+4$

C: 

\(f(t)=-\frac{21}{130}\,t+4\)

D: 

$f(t)=-\frac{19}{130}\,t+4$

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