(i) The power of term is 5x3 and exponent is 3. So degree is 3.
(ii) The power of term is y2 and exponent is 2. So degree is 2.
(iii) The power of term is 5t and exponent is 1. So degree is 1.
(iv) The only term here is 3 which can be written as 3x0 and so exponent is 0 or degree is 0.