- System of equations by addition method. 5x-7y=14 -2x+3y=-6?

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What is the contrapositive for the following statement? A∩Bc=∅ if A⊆B. Bc = B complement? If you were an astronaut and passed a kidney stone on the moon, would it be considered a moon rock? Solve for m: (1/49)^(4m-2) = 7^(-10m-2)? I need help w/ a complicated Pythagorean Theorem prob.This box won't allow me to put the whole question but I can comment it. Help please!? 5.905 times 100.04 is closest to what?