Subtract: 17 3 5 - 11 1 2 a) 6 2 3 b) 6 2 7 c) 6 1 10 d) 6 2 10

17 3 5 - 11 1 2 is ambiguous.  I believe you meant 17 3/5 - 11 1/2.  Must supply that " / " to indicate division.

It might be easier if you write this problem vertically:   Compute the following:

   17 3/5
  -11 1/2


Before you can do anything else, you must change the fractions 3/5 and 1/2 so that they share the same denominator (which we call the Lowest Common Denominator).  Hint:  The LCD here is 10.  

Can you now perform this subtraction?