- What's a pendulum used for? Is it accurate?

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The silica content of magma greatly affects its viscosity. Magma with a high silica content has a? Por que soy mas flexible cada año que pasa y sin hacer estiramientos? 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? A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20?