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More: How to determine the final speed in physics? The density of pure gold is 19,300kg/m3. Calculate the mass of a pure gold bracelet if it displace 2 x 10-6power m3 of water? Use substitution to find the intergral ∫ 1/(x^2+4x+5) dx , x=tan t- 2? Can the altitude to the base of an isosceles triangle be calculated? How many dipeptides can we form starting from 2 amino acids? 2 or 4 ? and why? thanks in advance?