What is 12' 0" − 3' 4" using the "same difference theorem"?

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

Which of the symbols correctly relates the two numbers below check all that apply 6? 6

What numbers are included in the set of integers? what numbers are not included?