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Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4? Does NASA still use miles instead of kilometers? 0.8 litres water is how many cups? Make a conjecture about the next item in the sequence.1, -4, 9, -16,? How long does Equazen supplement really take to make effect in adults with inattentive adhd? Has someone tested it?