$9-1$ In facility location problems, how many transportation models need to be developed to determine the best location of a new production facility?

$9-2$ Explain how to determine the number of variables and constraints in a transportation problem when only the number of sources and the number of destinations are known.

$9-3$ In assignment problems, why are variables always $0$ or $1?$

$9-4$ If a transportation problem has nine variables, how many sources are being considered?

Can u do it in table thx