- How does the body act if you're low on B12?

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Help with this please? If f(x)=7arctan(2sin(3x)), find f'(x)? What is the potential difference between xi = 2.0 m and xf = 3.0 m ? The area of a new park in the shape of a square is 10x^2+7x-12. What is the length of the side of the park? I can't calculate my semester grade becasu there are weights to every mark. Can someone show me a formula or something? An enzyme has a Vmax of 100 umol/min and a Km of 40 uM. When substrate concentration is 40 uM what is the initial reaction rate?