It `x\ a n d\ y` vary inversely, fill in the following blanks: (i) `x ,2, 16, ..., 8 ,...` `y ,... ,6 ,4 ,... ,0.25` (ii) `x ,16, 32, 8, 128` `y, 4 ,... ,... ,0.25` (iii) `x,9, ..., 81, 243` `y,27, 9, ..., 1`

If a\ a n d\ b vary inversely, fill in the blanks: (i) a, 8, 2, ..., 5, 1 b, 10, ..., 20, ..., 80 (ii) a, 16, 32, 8, 128 b, 4, ..., ..., 0.5

If x\ a n d\ y vary directly, find the missing entires in the following tables (i) x 2.5 ... ... 21 y 5 8 24 ... (ii) x ... 9 15 ... y 3 4.5 7.5 13.25

Complete the following tables given that x varies directly as y . (i) x, 2.5, ..., ..., 15 y, 5, 8, 12, ... (ii) x 5 ... 10 35 25 ... y 8 12 ... ... ... 21 (iii) x 6 8 10 ... 20 y 15 20 ... 40 ... (iv) x, 4, 9, ..., ..., 3, ... y, 16, ..., 48, 36, ..., 4 (v) x, 3, 5, 7, 9 y, ..., 20, 28, ...

In which of the following tables x\ a n d\ y vary inversely: (i) x, 4, 3, 12, 1 y, 6, 8, 2, 24 (ii) x, 5, 20, 10, 4 y, 9, 12, 8, 36 (iii) x, 4, 3, 6, 1 y, 9, 12, 8, 36 (iv) x 9 24 15 3 y 8 3 4 25

In which of the following tables a and b vary inversely: (i) a 8 16 32 256 \ b 32 16 8 1 (ii) a 9 18 2 12 b 8 4 30 6 (iii) a, 2, 16, 8, 4 b, 40, 5, 10, 20

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

If x=-2\ a n d\ y=1, by using an identity find the value: (4y^2-9x^2)(16 y^4+36 x^2y^2+81 x^4)

Fill in the blanks: 2x^2y+3x(4y)-2y(12x)+8=2x^2y- ______+8

Simplify the following: 7x^3+8y^3-(4x+3y)(16 x^2-12 x y+9y^2)

If x=3\ a n d\ y=-1, find the values of each of the using identity: (9y^2-4x^2)(81 y^4+36 x^2y^2+16 x^4)