Respuesta :

deborahvarghese1

Answer:

C. n=1.40

Step-by-step explanation:

just substitute it in or solve for the equations to get the unknown variable

chouniza
0.7n + 0.8n = 2.1
1.5n = 2.1
=>n= 2.1/1.5= 1.4
So, the ans is C. 1.40

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