- Find dy/dx of y=tan^-1(e^3x)?

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What is the theme used in "chemistry experiment"? How many mL of 12.0 M HCl are needed to make 2.0 L of 0.40 M HCl solution?
1. 17 mL 2. 15 mL 3. 67 mL 4. 96 mL 5. 420 mL? A cylinder with a height of 1.5" and a radius of 1.7" that weighs 37.7 pounds. What is the weight density of this material? Can you help me with an AP chemistry question? What volume of a 0.765 M solution of HBr is needed for a reaction that requires 17.3 g of HBr? Answers in units of L.?