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Suppose that the world's current oil reserves,

`R`

, is 2,080 billion barrels. If, on average, the total reserves is decreasing by 15 billion barrels of oil each year, answer the following: A. Give a linear equation for the total remaining oil reserves,

`R`

, in terms of

`t`

, the number of years since now.

`R=`

B. What is the total number of barrels of oil reserves 13 years from now? billions of barrels C. If no other oil is deposited into the reserves, when will the world's oil reserves be completely depleted? Round your answer to two decimal places.