Add the following. (a) `7.2+4.6 and b) 0.5+2.6`

1.Add the following : 5/7 and 2/7

Add the following : 5xy , 6yx and -2x^(2)

Add the following: i) 7a b c ,\ -5a b c ,\ 9a b c ,\ -8a b c ii)2x^2y ,\ -4x^2y ,\ 6x^2y ,\ -5x^2y

Add the following (i) 7abc , -5abc , 9abc , -8abc (ii) 2x^2y , -4x^2y , 6x^2y , -5x^2y

Add the following: x-3y-2z (ii) 4a b-5b c+7c a

If universal set U= {0,1,2,3,4,5,6,7}, A={2,3,7}, B={4,6} and C={0,2,4,6} . Find the following (i) A cap phi (ii) B' cap C (iii) A' cap C (iv) A cap A'

Show that A B!=B A in the following case: A=[5-1 6 7] and B=[2 1 3 4]

Find the mean of the following data. (i) 3, 5, 3, 4, 2, 0, 7 and 10 (ii) 6.2, 5.6, 4.8, 11.2, 12.5, 7.4 and 6.3 (iii) 16, 39, 43, 120, 475, 248, 368

Add the following algebraic expressions : 2a - 3b + 4c , -3a + 2b - 5c , 7a - c and 3b + 6c

Use number line and add the following integers : (a) 9+(-6) (b) 5+(-11) (c) (- 1 )+ (-7) (d) (-5) + 10 (e) ( -1 ) + ( -2 ) + (- 3 ) (f) ( - 2 ) + 8 + (- 4)