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hi, there is a common proof that has come up quite often in past trial and hsc questions : prove: a a { f(x) dx = { f(a-x) dx 0 0 which i understand as you just use the...

HI i was just wondering if in the exams you will get a few minutes before hand to write your candidate number on different booklets.. during my trial i made the mistake of leaving writing my number and book numbers till the end.. since it was only a trial teachers let you just write your number...

hi i'm having a little trouble understanding the half equations for the electrolysis of water: from the table of standard potenstials the two equations involving water are: 02 + 4H+ +4e- --> 2H2O (E0 = 1.23V) 2H2O + 2e- --> H2 + 2OH- (E0 = -0.83V) for the half...

hi, i'm having some trouble with a rates of change question that involves the rate of change of the surface area of a bubble and then having to calculate the rate of change of volume: the surface area of a spherical bubble is increasing at a constant rate of 1.9 mm^2/s. find the rate of...

HI I’m in desperate need of help! I can’t seem to understand the concept of cube roots of unity. Can someone please show me how to attempt the following question: If Z is one of the three cube roots of unity, find the two possible values of z^2 + z + 1 . I tried using the formula: Z = nthroot(r)...