B={x:x+5=5} is not an empty set. Why?

If P={x:(x-8)/(2)=4} . Is P an empty set? Justify.

The solution of the set {x:x inR, x^(2)=9,2x=9} is an empty set .

Answer the following question and Justify your answer. B={x:x +5=5}. It is a null set or a universal set?

State true or false: R={(a,b) : a+b=5} is an empty relation in the set of whole numbers.

Let T = {x|(x+5)/(x-7)-5=(4x-40)/(13-x)} . Is T an empty set ? Justify your answer.

Let T = {x|(x+5)/(x-7)-5=(4x-40)/(13-x)} . Is T an empty set ? Justify your answer.

Let T= {x|(x+5)/(x-7)-5 = (4x-40)/(13-x)} . Is T an empty set ? Justify your answer.

State true or false: R= {(a,b) : a,b in A, ab=100} is an empty relation in the set A={ x : x in N, x<10}

Let X and Y be two non-empty sets such that XnnA=YnnA=phiandXuuA=YuuA for some non-empty set A. Then