Batteries are useful because they are use to make things work and that energy is electricity.
In a braking system
Yes.
could someone please answer this
Smelting
all you have to do is sometimes get usful
If you didn't have one, how would you work on anything mechanical.
They're useful because I'm awesome
The rosetta stone is used to read hierogyphics.
They are great for war and usful for research anf tourism.
because ruben morales talked about it
They are not but are something that a lot of pupils are familiar with. They are a usful tool for visualising fractions.
Animals are very useful. For example, they provide food, clothing, and companionship.