- System of equations by using the addition method, solve for x+2y=-4 and x+y=2?

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Whats your favorite Long Neck Dinosaur (Sauropod) mine is the Camarasaurus? How do we know that the Galaxies are not moving in unison just like runners in tracts moving at different speeds but same angular velocity? What percent of $13424 is $4714? Show that the expression (x+y)(x-y)-16x+64 may be written as the difference of two squares, and then factor the expression.? Why is a test charge always very small?