- How many twins were born in 1950?

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What is the reference angle of 1,406 degrees? Is it 35? How do you find the reference angle of such a large number? Is Space completely quiet? How does "x^2-4x+4=49" come from "(x-2)^2=49"? Where does the "-4x" come from? I can't calculate my semester grade becasu there are weights to every mark. Can someone show me a formula or something? N=2->n=3 is it emission or absorption?