True or false multiplying 0.001 is the same as dividing by 1,000?

True.
Example:
.001 times 1,000 is the same as moving the decimal of .001 to the right three times. ( =1)

1,000 divided by 1,000 is the same as moving the decimal of 1,000 to the right three times. (=1)

Both expressions have the same answer. So therefore, your statement is true.

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction