Given the model equation of the first question:
[tex]y=140.9x+370.4[/tex]
And assuming "x" stands for the time, "t", in days, we can calculate which day, "x", the number of infected people will reach 7000 by setting y = 7000 and solving for x:
[tex]\begin{gathered} y=140.9x+370.4 \\ y=7000 \\ 7000=140.9x+370.4 \\ 140.9x=7000-370.4 \\ 140.9x=6629.6 \\ x=\frac{6629.6}{140.9} \\ x=47.05\ldots\approx47 \end{gathered}[/tex]
So, the number of infected people will reach 7000 around day 47.
