Which of the following is a typical stored energy used to power today’s vehicles?

Kyle, a receptionist for a building supply company, recently won an award for saving his company money on their phone system. after being presented with kyle's research, the company changed the way in which it made long-distance phone calls and cut their expenses in this area by 75 percent. the new system the kyle's company most likely adopted was wired communications switching stations voip hdtv

Does read theory have answers keys ?

What is one reason why indoor air pollution has become an increasing problem.