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`( -6/19 ) + 0 = 0 + ( -6/19 )`

The value of charge on the oil droplets experimentally observed were -1.6 xx 10^(-19), - 2.4 xx 10^(-19) and - 4xx10^(-19) C. The value of electronic charge, indicated by these results is (1) -1.6 xx 10^(-19) (2) -2.4 xx 10^(-19) (3) -4 xx 10^(-19) (4) - 0.8 xx 10^(-19)

7x^(2) - 19x -6 = ?

(i) 15x^(2) - 8x + 1 = 0 (ii) 6y^(2) - 19y + 10 = 0

5 (2x - 7 ) -3 ( 2x + 3 ) le 0, 2x + 19 le 6x + 47

19 xx 12 + 19 = 19 xx (12 + _____)

6 19 58 ? 214 331

The sum '5 + 6 + 7 + 8 + .... + 19' is equal to :