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HELP HOW TO FIND THE DERIVATIVE OF THIS?????? In right △ABD, the length of the hypotenuse AD is 15. C is a point on DB such that AC = 13. If AB = 12, find DC.? If you only had one mole of Fe to start with, how many moles of Na would be produced? Using the balanced equation Fe + 3NaBr-> FeBr3+ 3Na? Is this true? If ƒ(x )= 2x^2 + 3, then ƒ(x - 1)= 2x^2 + 4x + 5.? Is there a south star directly over the south pole that is stationary in the sky of the southern hemisphere?