Joey works at the airport repairing airplane engines, where the decibel level can reach over 100 db. wearing protective earwear, the decibel level reacing joey's ear only reaches 80 db. how many times less intense is the sound with his ear protection when compared to no protection?

23. public and private investment in infrastructure include all of the following except a) worker knowledge and skill development b) telecommunication systems, internet provider systems, and power distribution systems c) highways, transit systems, airports, harbors, and educational facilities d) fire departments, police departments, and public safety systems e) water systems, wastewater treatment systems, and navigational systems

How did the large influx of immigrants change america?

Doing a science fair project should i do cafeteria waste or solar power