- Any easy way to solve questions related to 3D shapes??

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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? If 7.46g of CrCl3 are dissolved in enough water to make 385 mL of solution, what is the molarity of the resulting solution? Discrete Help ASAP. Please write out symbolic notation.? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? Name a class of annelids whose members may have protonephridia?