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A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? The silica content of magma greatly affects its viscosity. Magma with a high silica content has a? 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? What day will it be exactly 6 months from June 14th, 2017? Best answer gets buncha stars? =B y I y is an integer and ≤−4