Word Question need help pease

Question

Suppose that the world's current oil reserves is R=1920 billion barrels. If, on average, the total reserves is decreasing by 15 billion barrels of oil each year, answer the following:

Give a linear equation for the total remaining oil reserves, R, in terms of T, the number of years since now.

9 years from now, the total oil reserves will be ? Billions of barrels

 If no other oil is deposited into the reserves, the world's oil reserves will be completely depleted (all used up) approximately ?? many years from now. round answer to two decimal places

Answer 1

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Answer 2

R = 1920 - 15T

R = 1920 - (15)(9)

0 = 1920 - 15T