Why did the pharaoh in egypt free the hebrews

Explanation: Pharaoh refused for a couple of reasons. One was the perceived financial loss if all the free labor would cease, as he himself implied (Exodus 14:5). Another was sheer obstinacy, in which he hardened his heart.

A careful reading of Exodus (ch.7-12), at least in the original Hebrew, reveals that Pharaoh hardened his own heart in most of the plagues. God only hardened Pharaoh's heart in three of the ten plagues: the sixth, eighth and ninth. That's all.  

Then after the last plague Pharaoh was angry and released the Israelite to go to the promised land

study of past cultures

lots of people lost money in both