book Maths Puzzle Numerical Ability

e^lnx+lny=x+y. I believe this to be true but I am not sure. Am I right?

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book Other Question

evaluate the function for the indicated value: f(x)=x2+2x-7 find f(-4) How many kilos of hard candies that is worth PHP 210 per kilo must be mixed with 12 kilos of chewy candies that is worth PHP 240 per kilo to produce an assortment of goodies that is worth PHP 230 per kilo?