Question $2$:

A simple linear regression model is estimated for home$-$based shopping trip during the PM peak hour. The model is

HBS $=0\mathrm{.}1+0\mathrm{.}09($household size$)+0\mathrm{.}02($annual household income in thousands of dollars$)-0\mathrm{.}15($employment in the household's neighborhood, in hundreds$)$

A particular household has six members and an annual income of $$50,000.$ They currently live in a neighborhood with $450$ retail employees, but are moving to a new home in a neighborhood with $150$ retail employees. Calculate the predicted number of HBS peak$-$hour trips the household makes before and after the move.