Suppose that the world’s current oil reserves is R= 2080 billion barrels. If, on average, the total reserves is decreasingby 23 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.) 13 years from now, the total oil reserves will be_____ billions of barrels.C.) If no other oil is deposited into the reserves, the world’s oil reserves will be completely depleted (all used up) approximately_____ years from now.(Round your answer to two decimal places.)