It's know as 'ten code.' Even though there can be different meanings to the codes depending on who is using it, 10-4 is universally accepted as meaning the last communication was received and understood correctly.
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lets say what = x so 10*x=4 4/10=x x=0.4
4, 20, 25
No not always true. Say you have a mixed number of 4 and 9/10 tines a fraction 9/10 you have 49/10 x 9/10 = 441/100 = 4.41 which is greater than 4
Try it on your scientific calculator. It will say 2.5e+4.
4