The solution of your problem is shown on the picture below.
<span>nth term = 7n - 3
n = 1,2,3,4....</span>
-26 < 54
Negative numbers are smaller than positive numbers
What goes in goes out. This means none of the current is lost. So if 0.7amps+0.68amps+0.47amps = 1.85 amps comes in, then 1.85 amps goes out. So far we have 0.8 amps+0.55 amps going out= 1.35 amps. This means we need an additional 1.85-1.35amps going out= 0.5 amps for the third outgoing current. Cheers!