If a sample has 1/8 of the radioactive nuclei left, HOW MANY HALF-LIVES WOULD THE SAMPLE HAVE GONE THROUGH?

The graph has the start of it with 200.
PLEASE HELP!

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

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