Thallium- 208 has a half life of 3 minutes How much of a 60.0 sample of thallium -208 will be left after 4 half lives

I'd go for the one that says that knees are fulcrums, lower legs are levers and the ankles hold loads.hope it ,happy homework/ study/ exam!

Answer the radiant sun;

What the heck r u talkin bout? ?

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.