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Exponential Functions

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"Decreasing by 6.5% per year" means decreasing to (100-6.5)%=93.5%, or .935, of the previous year's value.
After two years, the acreage will have decreased to .9352 of the original value (10,500,000 acres), and after 15 years it will have decreased to .93515 of its original value, namely
.93515*10,500,000 ≈ 3,830,000 acres.
Dear Jenna,
In general, for any situation where there is exponential decay, the equation would be
At = A0e-kΔt
where At is the amount remaining after time Δt has passed, A0 is the initial amount, and k is a constant, in this case 6.5% of 0.065.
At = (10,500,000 acres)*e(-0.065)*(15 years) = (10,500,000 acres)*(0.377192) = 3,960,519 acres