Question $1$

The Cobb$-$Douglas production function $is$ given $byf(x_1,x_2)=A{x}_1^a{x}_2^b.It$ turns out the types $of$

returns $to$ scale $of$ this function will depend $on$ the magnitude $ofa+b.$ Which values $ofa+b$

will $be$ associated with the different kinds $of$ returns $to$ scale $(i.e.$ constant, increasing and

decreasing$)?[5$ points$]$