Billy has $3.00. Bubble gum costs $.30. He bought four pieces. How much money does Billy have left? plz help me

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you

When scientist examine data such as historical documents, they are using the "scientific methods"