- What is the the main difference between geocentric and heliocentric models of the solar system?

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Use a cofunction to write an expression equal to sin pi/7? How much rain did we receive last night at this zipcode 79237? What is the enswer for the equation y=x+4and x+y=2? How does "x^2-4x+4=49" come from "(x-2)^2=49"? Where does the "-4x" come from? What subject is harder “Visual Communication Design or Geography?”?