The amount of radioactive substance remaining after two years of green by the function f(t) = (0.5) t/h, where m is the Initial message and age is the half life in years, but 60 has a half-life of about 5.3 years which equation does the mass of 50 mg Copart 60 simple meaning after 10 years and approximately how many milligrams Remain

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.  

the one below it is a function

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)