Josh finds that there definitely is a relationship between enzyme action and temperature and graphs his results. the enzyme functions as a biological catalyst and has its optimum effectiveness at a) 30 degrees. b) 39 degrees. c) 59 degrees. d) 60 degrees.

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?