Which reaction is used to produce polyethylene (c2h4 )n from ethylene?

Iknow #2 is d. i just need to know why

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h