- Let A be the area of a circle with radius r. If dt/dr=3, find dt/dA when r=5.?

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How many grams of calcium are needed to produce 16 moles of iron ? The equation for the reaction is 2 FeBr3 + 3 Ca -> 3 CaBr2 + 2 Fe? Find the area of the region that is bounded by the given curve and lies in the specified sector. r = √(sin(θ)), 0 ≤ θ ≤ π? Pt(s) ΙSn2 (0.0055 M), Sn4 (0.12 M) ΙΙFe2 (0.0020 M), Fe3 (0.15 M) ΙPt(s) Calculate the voltage of the cell, ΔEcell, including the sign.? What type of question? How to put y=x squared+8x+3 into vertex form?