`x+7=18` Is true or false? Justify

Whether a quadrilateral has ten elements.Is it true or false? Justify.

Are the following statement true or false ? Justify the answer : Every integer is a whole number.

State whether the following statement is true or false? Justify your answer. There are infinitely many integers between any two integers.

State whether the following statements are true or false. Justify your answer 7cancelin set of prime numbers

State the following statement is true or false. Justify your answer. { 2, 6, 10 } and { 3, 7, 11} are disjoint sets.

State whether the following statements are true or false. Justify your answer. S={5,6,7} implies 8 in S.

State whether the statement 'every rectangle is a parallelogram, is true or false. Justify.

Let A = {{1, 2, 3}, {4, 5}, {6, 7, 8}}. Determine whether the following is true or false . Justify your answer . 1 in A .

Let A = {{1, 2, 3}, {4, 5}, {6, 7, 8}}. Determine whether the following is true or false . Justify your answer . {{4, 5}} sub A .