Energy efficiency is all the ways that can be used to save energy consumption . Energy efficiency will make the needs of the energy will decrease . Examples of energy efficiency is to use energy-efficient electrical appliances . The number of the world's human population is very much . And all require energy . Some energy sources are included in the amount of energy that does not have a limited or called non - renewable energy . For energy type of non - renewable energy will someday run out . Nature takes very long to provide the energy for humans . Examples of non - renewable energy is petroleum , natural gas , coal , and others . With a number of requirements for the energy very much , while the energy -making requires a very long time , thousands of years , the human need to improve efficiency for the use of non - renewable energy . Many men have been concerned with this,
For some people, math is a difficult subject to master. If parents who have problems like that, of course, will have trouble when they serve as a math homework help for their children. It would be nice when the children ask their parents about the algebra 1 or algebra 2 , they can answer it. But, how do we study mathematics? Should we go back to school? I think, there are many ways to learn math again. For example, by using an online tutorial that provides math statistics help , calculus help , geometry help , Algebra 2 Help and others. I think, our kids will be more proud of us, when we could help for their math homework.