b$.$ Quadratic Trend: hat$(y)=19\mathrm{.}48+0\mathrm{.}99t-0\mathrm{.}02t^2($Round intermediate calculations to at least $4$ decimal places and final answer to $2$ decimal places.$)$

hat$(y)=$

c$.$ Exponential Trend: widehat$(ln(y))=2\mathrm{.}1+0\mathrm{.}08t,s_e=0\mathrm{.}02($Round intermediate calculations to at least $4$ decimal places and final answer to $2$ decimal places.$)$

hat$(y)=,201\mathrm{.}00$