Which of the following expressions are polynomials in one variable and which are not State reasons for your answer. (i) `5x^(2)-3y+10,` (ii) `y^(2)+sqrt(2),` (iii) `3sqrt(t)+t sqrt(2)` (iv) `y+(2)/(y),` (v) `x^(10)+y^(3)+t^(50),`