5. R is the set of negative real numbers. The following statement is true: YS ER:SteR such that st = 18. For s = -7/8, find a t to make the predicate st = 18" true. (6 points) 6. Prove that Vs e UseQ+5-3/14 EQ. SHOW ALL WORK, AND EXPLAIN YOUR REASONING! In order to have a chance for full credit, you must explicitly use the definition of and you can only use closure properties of the integers (Z). (10 points)