- Math problems about equivalence relations,etc?

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How many milliliters of a stock solution of 12.0 M HNO3 would you have to use to prepare 0.500 L of 0.200 M HNO3? What are gradually changes on earth? Hallar la ecuaciĆ³n de la recta que cumple condiciones dadas: pasa por (-3,4) y es perpendicular a la recta y=3x+2? Suppose that 273g of the substances listed above displaces 26ml of water. What is the substance? If A' is the image of A and line k is a perpindicular bisector of AA', sketch the figure and describe the transformation?