Write the degree of each polynomial given below:
(i) xy+7z (ii) x2−6x3+8
(iii) y−6y2+5y8 (iv) xyz−3
(v) xy+yz2−zx3 (vi) x5y7−8x3y8+10x4y4z4
Write the degree of the polynomial x cube + y square + 1