Mr. cooper ask his students whether they prefer to go to the aquarium or the planetarium for a field trip. the table shows the result

1gm = 1000mg so 0.1gm = 1000mg

first, convert the weight to kg

160lb * 1kg/2.2lb = 72.7kg

next, the dose

72.7kg * 100mg/kg = 7270mg

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225