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Question

The number of pages in the IRS Tax Code has increased from 400400 pages in 1913 to 70,32070,320 pages in 2009. The increase can be modeled by the exponential function

T(x)=400(1.055)x,T(x)=400(1.055)^x,

where xx is the number of years since 1913. Use this function to estimate the number of pages in the tax code for 1950, 1990, and for 2000. Round to the nearest one.

Solution

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Answered 1 year ago
Answered 1 year ago
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By substituting in the function

T(x)=400(1.055)x\begin{aligned} T\left(x\right)=400\cdot\left(1.055\right)^x \end{aligned}

, for the values x=37,77x=37,77, and x=87x=87, respectively, where xx represents the number of years since 19131913, the following is true:

T(37)=400(1.055)37=4007.25=2,900T(77)=400(1.055)77=40061.721915=24,688.76624,689T(87)=400(1.055)87=400105.429947=42,171.978842,172\begin{aligned} T\left(\textcolor{#4257b2}{37}\right)&=400\cdot\left(1.055\right)^{\textcolor{#4257b2}{37}}\\ &=400\cdot7.25\\ &=2,900\\ T\left(\textcolor{#4257b2}{77}\right)&=400\cdot\left(1.055\right)^{\textcolor{#4257b2}{77}}\\ &=400\cdot61.721915\\ &=24,688.766\\ &\approx24,689\\ T\left(\textcolor{#4257b2}{87}\right)&=400\cdot\left(1.055\right)^{\textcolor{#4257b2}{87}}\\ &=400\cdot105.429947\\ &=42,171.9788\\ &\approx42,172 \end{aligned}

Therefore, the number of pages in the tax code for 19501950 was 2,9002,900 pages, for 19901990 was 24,68924,689 pages, and for 20002000 was 42,17242,172 pages.

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