Which of the following are true? `0 in N`,`0!in Z`,`sqrt3in T`,`1/2in Q`

Which of the following is quadratic equation: x^2+sqrt2x+3=0 .

Which of the following is quadratic equation: 2x^2+3sqrtx+1=0

Which of the following is quadratic equation: x^2+sqrt3x+sqrt5=0

State which of the following sets are closed under the operation : addition R,Z,N,Q,W,C,R-{0}

State which of the following sets are closed under the operation : subtraction R,Z,N,Q,W,C,R-{0}

State which of the following sets are closed under the operation : division R,Z,N,Q,W,C,R-{0}

Test which of the following is solutions of 6x^2-sqrt2x-2=0 i) -sqrt2/3 ,ii) -sqrt2 ,iii) 1/sqrt2 ,iv) sqrt(2/3)

What is the sum of the diagonal elements of the following square matrix? [(1, 0, 1),(0, 1,2),(3, 1,-2)] .

Which.of the following relations are functions?f={(2,1), (3,0), (4,1)}

Test which of the following as solution of 2x^2+5x-3=0 x=1/2