Hey there!
Here is your answer:
The proper answer to this question will be "t-(8)".
Reason:
Look at the way the question is worded the word "difference" will mean its subtraction, and t would go first since its in the question and it goes first: t-8=! T representing the variable so you can add ( around the 8 so... t - (8)=.....
Therefore the expression should be t - ( 8 ) =
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit