3. Add the following algebraic expressions.
i. 7x2 – 3x², 11x2, - 5x2 and 8x?
ii. x + 2y - 3z, - 3x + y + 2z and 2x - 3y + z
iii. 20a + b -c, a - 20b + c and a + b - 20c
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In early production, first calcium cyanamide was converted into dicyandiamide, which was heated above its melting temperature to produce melamine. Today most industrial manufacturers use urea in the following reaction to produce melamine: 6 (NH2)2CO → C3H6N6 + 6 NH3 + 3 CO.
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Answer is given above I am sorry because my maths paper is tommorow
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