Question: Problems concern the future of the US Social Security Trust Fund, out of which pensions are paid. Figure 5.61 shows the rates (billions of dollars

Problems concern the future of the US Social Security Trust Fund, out of which pensions are paid. Figure 5.61 shows the rates (billions of dollars per year) at which income.

I(t), from taxes and interest is projected to flow into the fund and at which expenditures, E(t), flow out of the fund. Figure 5.62 shows the value of the fund as a function of time.

bn $/yr 1375 1175 975 fot 775 2015 2017 2019 2021 Auf-

Figure 5.61 E(1) I(1) 2021 2023 2023 2025 t(year)

Express the projected change in value of the fund from 2016 to 2025 as an integral.

bn $/yr 1375 1175 975 fot 775 2015 2017 2019 2021 Auf- Figure 5.61 E(1) I(1) 2021 2023 2023 2025 t(year)

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