Answer:
6
Step-by-step explanation:
7 days equal 604.8 ks (1 kilosecond=1000 seconds)
Hope this helps!

This equation has only one solution
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P.S. Hello from Russia
-4a - 6 = -12
-4a = -12 + 6
-4a = -6
a = -6/-4
a = 6/4
a = 3/2
a = 1 1/2
The answer is c