What expression is equivalent to 2^-3/2^-5?

How is this equation completed? i cannot find any examples in the book.

Carl is hanging pictures in his home. there is a space on a wall that has a width of 4 feet. carl has pictures with different widths. which picture width would fit in the space on the wall? a. 46 inches b. 60 inches c. 50 inches d. 54 inches

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question