Question

Help this is due tomorrow

Answer 1

The choice second;

`n = 1.40`

Explanation:

`0.7n + 0.8n = 2.1 \\ 1.5n = 2.1 \\ \\ n = (2.1)/(1.5) \\ \\ n = (21)/(15) \\ \\ n = 1.4`

I hope I helped you^_^

Answer 2

n = 1.40 (second option)