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In 1950, the use of coal in the US was 114.6 million tons. The use of coal has decreased by 6.6% per year since then. Estimate the amount of coal used in the US in 2010. Round to the nearest tenth of a
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In 1950, the use of coal in the US was 114.6 million tons. The use of coal has decreased by 6.6% per year since then. Estimate the amount of coal used in the US in 2010. Round to the nearest tenth of a million tons.

User Alldayremix
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The exponential function
c(x) = 114.6×(1 -0.066)^x
evaluates to about 1.9 (million tons) for x = 60 years after 1950.

The amount of coal used in the US in 2010 is estimated at 1.9 million tons.
In 1950, the use of coal in the US was 114.6 million tons. The use of coal has decreased-example-1
User Antoine OL
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