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What type of energy does a battery contain? What percentage of Earth is uninhabitable? D. What is the minimum amount of ice at -10°C that must be added to 0.50 kg of water at 20°C in order to bring the temperature of the water? If the air outside is warmer than the air indoors, does keeping the windows open increase or decrease the indoor temperature? Show that the equation 2tan^2 x sin^2 x=1 can be written in the form 2sin^4 x +sin^2-1=0?