the half life of a substance is the amount of time it takes for half of the atoms in a sample of the substance to decay. the half life of cobalt-60 is 5.26 years. if Joan has a 100-gram sample, which graph best represents how much cobalt-60 will be left after 30 years?

.mp4 files, because, video

step-by-step :

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

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