b$.$

Calculate the single exponential smoothing forecast for these data using an $\backslash$alpha of $0\mathrm{.}20$ and an initial

forecast $($F$1)$ of $162.$

c$.$

d$.$

Calculate the exponential smoothing with trend forecast for these data using an $\backslash$alpha of $0\mathrm{.}20,$ a $\backslash$delta of $0\mathrm{.}20,$

an initial trend forecast $($T$1)$ of $1,$ and an initial exponentially smoothed forecast $($F$1)$ of $161.$