Draw the structure of (Z)‑3‑bromo‑6‑methyl‑2‑heptene. Be sure the stereochemistry is drawn clearly. *can someone please help, this question has me so stressed out*

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.