Answer
In $1950,\ \quad 1457$ parts per billion
In $2000,\ \quad 1741$ parts per billion
In $2050,\ \quad 2080$ parts per billion
In $2100,\ \quad 2486$ parts per billion
Work Step by Step
In 1950, $\quad t=200$ (years after 1750)
In $1950,\ \quad C(200)=715e^{0.00356(200)}\approx $1457.21526
In $2000,\ \quad C(250)=715e^{0.00356(250)}\approx $1741.11770
In $2050,\ \quad C(300)=715e^{0.00356(300)}\approx $2080.33151
In $2100,\ \quad C(350)=715e^{0.00356(350)}\approx $2485.63277
