"10 4" is used over radio transmissions to confirm that a message was cleared received and understood. It means: "transmission received"
-TR
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10/4 = 2.5 or 2 1/2
The "4" in "2.4" means four tenths.We can write this in various ways such as: 4/10, 0.4 or 4 * 10-1 (this is the actual meaning in the decimal system).
If you're meaning 9.21 x 10-4 than the standard numeral would be 0.000921.
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.
The answer has a meaning only in 4-dimensional space. 10 sq ft * 7 sq ft = 70 quartic feet.