"rubber ducky" is a callsign, someone's 'code' name. While 10-4 means 'understood'
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To find the ARITHMETIC mean of 4 and 10, you add them up and then divide by n number of values: (4+10)/2 = 7 To find the GEOMETRIC mean, you multiply 4 and 10, and then find the nth root: the square root of 40 is 6.32 (to 3 significant figures).
If you mean: (4-2)-(3*4) then it is -10
Yes if you mean 2.3 x 10^-4 in scientific notation
If you mean: -10(-6a-4)-9(2+4a) then it is 24a+22 simplified