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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...

i found the exact same question posted on yahoo, take a look at answer 2, now that i see the setting out i think i may just understand it! A complex number roots question.? - Yahoo! Answers

hi thanks for replying so fast! i tried both of these methods, i understand equating it to 0 but i'm not sure of where they are getting 3

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)...