- Solve for x: arccos(2x)+arccos(x)=pi?

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How many edges in a circle? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? 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? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)?

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