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  1. S

    differentiation

    ok i am haing troubles with this question. differentiate: y=x^4(9x-1)^5 NOw i understand how to differentiatiate like to get this x^4.45(9x-1)^4 + (9x-1)^5.4x^3 but i don't understand how to get to x^3(9x-1)^4(81x-4) can someone please explain thanks.
  2. S

    soluble ions

    Does anyone know any test to check for silver and Mecury Ions?
  3. S

    Average Assessment %

    god you'se are heaps smarter then our school. Our highest average is like umm 78% or around that.
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