A sample of a radioactive substance decayed to 97% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? :Ix W (b) How long would it take the sample to decay to 80% of its original amount? :lvr A thermometer is taken from a room where the temperature is 20C to the outdoors, where the temperature is 1C. After one minute the thermometer reads 10C. (Round your answers to one decimal place.) (a) What will the reading on the thermometer be after one more minute? :l C (b) When will the thermometer read 2C? A roast turkey is taken from an oven when its temperature has reached 185F and is placed on a table in a room where the temperature is 75F. (Round your answers to the nearest whole number.) (a) If the temperature of the turkey is 150F after half an hour, what is the temperature after 60 minutes? nee) = :] F (b) When will the turkey have cooled to 90F