Do the following production functions exhibit decreasing, constant, or increasing returns to scale? $[3$

Points each$]$

$($a$)$ Q $=0\mathrm{.}5$KL $($d$)$ Q $=$ max$(3$K$,2$L$)$

$($b$)$ Q $=2$K $+3$L $($e$)$ Q $=2$K $1/4$ L

$($c$)$ Q $=$ L $+$ L$1/2$ K $1/2+$ K