- Why forming iron into a horseshoe is not considered as a chemical change?

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Can too much astronomy be dangerous? Can we resolve velocity? Y= x / tanx Given x increasing at 2 units per second. find rate of change of y when x=π/4? X^3+3(1-√2)x^2+(5-6√2)x+3-√2=0 Show that the roots of the polynomial are in arithmetic progression and solve the polynomial? What's the plate activity in the outerpart of the gesophere? Help anyone please??