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There is no value per-say. You can buy 78's at flea markets for a quarter. It depends on your buyer and how much they want the record that you have. It is only worth what someone is willing to pay for it. There are not many 78's that hold any significant value... in most cases you would be lucky to get a dollar.
To a collector maybe about 10$.
Depending on condition. Hound Dog 78 value -$75-$100
how do you know a 78 record is a first run
is the band good
The absolute value is just determining how far the number is away from "0". -78 is 78 numbers away from zero, thus the absolute value of -78 is 78.
A 78 is a gramophone record played at 78 revolutions per minute.
The value of 8 in 78 is 8.
That would depend on numerous factors regarding the record - much more detail is required
with melba, maybe $10 US.
absolute value of -78 is 78