What invention did henry ford create that assisted in the manufacture of cars?

Henry Ford invented the procedure of manufacturing cars on an assembly line. This means that cars were manufactured in a serial way, rather than building each of them one at a time. This invention assisted in the manufacture of cars.

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