- Simplify please?

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If 7.46g of CrCl3 are dissolved in enough water to make 385 mL of solution, what is the molarity of the resulting solution? Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? Find the complement of the angle 3pi/7. Please show steps!? How many milliliters of concentrated of sulfuric acid (18 M) are required to make 7.0 L of 0.12M H2SO4? What is cycle time for astm?