What did king Cnut require of his English subjects?

Explanation:

Cnut ruled England for nearly two decades. The protection he lent against Viking raiders—many of them under his command—restored the prosperity that had been increasingly impaired since the resumption of Viking attacks in the 980s. In turn the English helped him to establish control over the majority of Scandinavia, too.

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement