Question

WILL GET BRANILYEST SO PLEASE HELP ME :(

Answer 1

$\bf \textit{surface area of a cylinder}\\\\ SA=2\pi r(h+r)~~ \begin{cases} \textit{units all tripled}\\ h=3h\\ r=3r \end{cases}\implies SA=2\pi (3r)(3h+3r) \\\\\\ \begin{cases} r=\stackrel{mm}{4}\\ h=\stackrel{cm}{1.5}\\ ~~~~\stackrel{mm}{15} \end{cases}\implies SA=2\pi (12)(45+12)\implies SA=24\pi (57) \\\\\\ SA=1368\pi$

now, recall, the exercise is assuming you're using π = 3.14.