Question

Vamos, Me ajudem!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!! Urgenteeeeeeee!!!!!!!!!!!

Answer 1

$d= \frac{m}{v}=>4= \frac{m}{30}=> m=120 \\ \\ d= \frac{m}{v} =>2= \frac{m}{70}=>m=140 \\ \\ \\ d= \frac{(120+140)}{(30+70)} =>d= \frac{260}{100}=>d=2,6g/cm^{3}$