You mix two cleaning chemicals and they start bubbling and releasing a funny smelling gas. First, run because it is poisonous! Second, was that a physical or chemical change? How do you know?

it's a chemical change

Explanation:

When two different chemical substances are mixed they are no longer the same and can not be changed back so therefore it's a Chemical reaction.

23.5

23.5

47.0

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying