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What is the highest unclimbed mountain that is not in Bhutan? What mass of Al2O3 is produced when 81g of Al undergoes complete combustion (with workings please)? If f(x)=x^2-1 and h(x)=4x+3, then f(h(2))=? 12ft x12.5 ft what is the square footage? What is the difference in PE between a 82.5 kg adult on a 1.25 m wall, and a 14.7 kg child on the same wall?. Answer=J?