Question

Help please I dont know how to do this.

Answer 1

`0.000000778\implies \stackrel{ \textit{rounded up} }{0.000000800} ~\hfill 0.00000000155\implies \stackrel{ \textit{rounded up} }{0.00000000200} \\\\[-0.35em] ~\dotfill\\\\ 0.\underset{ 6~zeros }{\underline{000000}}800\implies 8.00* 10^(-6)\implies \boxed{8* 10^(-6)} \\\\\\ \underset{ 8~zeros }{0.\underline{00000000}200}\implies 2.00* 10^(-8)\implies \boxed{2* 10^(-8)} \\\\[-0.35em] ~\dotfill`

`\cfrac{\stackrel{ \textit{dust particle} }{8* 10^(-6)}}{\underset{ \textit{grain of pollen} }{2* 10^(-8)}}\implies \cfrac{8}{2}*\cfrac{10^(-6)}{10^(-8)}\implies 4*10^(-6)10^(8)\implies 4* 10^2\implies \boxed{400}`