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Is it dangourous to lick salt and vinegar off you finger if the salt and vinegar had pennies in it? How to calculate the concentration of the acid? Solve for X. X^4 - X^2 - 72 = 0? If x#y= (x.y)/(x+y) then 4#3 = 4x3/4+3 =1 remainder 5 If 5#x =2 remainder 5, determine the value of x? How to find equation of circle given two points and equation of diameter?