- Is there a imaginary number line?

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What happens when FeS is heated to 600 C in the volatile solids test? How many moles of KBr are present in a 25mL of a 1.5M solution? If the KBr were isolated and dried, how much would it weigh? I need help with this Calculus problem involving approximations for sine and cosine. Please show work! Thanks!? Point charges of 5micro and -3micro charge are placed 0.250m apart.Where can a third charge be placed so that the net force on it is zero? Why is a centroid in math commonly known as "P"?