$1-$ How many simple regressions could be run from this data set? $($Identify the dependent variable and independent variable for each simple regression you identify$).$

$2-$ State one multiple regression that could be run from this data set $($identify all independent variables$)$

$3-$ What is the N $($how many data points in the data set$)$ for the variable $$Advertising Spending$?$

$4-$ How many data points are lost in the $1,3,$ and $5$ month $$Prior Advertising Spend$$ lagged variables compared to the $$Advertising Spending$$ variable $($identify the number of lost data points for each of the $3$ lagged variables$)?$