Please help me find the value.

List the elements of the set in roster notation. (enter empty or ∅ for the empty set.) {x | x is a letter in the word hippopotamus}

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.