Add the following rational numbers :
(i) −25 and 45 (ii) −611 and −411 (iii) −118 and 58
(iv) −73 and 13 (v) 56 and −16 (iv) −1715 and −115
Verify commutativity of addition of rational numbers for each of the following pairs of rational numbers: (i) −115 and 47 (ii)49 and 7−12 (iii) −35 and −2−15 (iv) 2−7 and 12−35 (v) 4 and −35 (vi) −4 and 4−7