If the activity of a radioactive substance is initially 396 disintegrations/min and two days later it is 281 disintegrations/min, what is the activity four days later still, or six days after the start? Give your answer in disintegrations/min.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

amplitude

hope this