Introduced by john rolfe, tobacco became an extremely valuable crop to james towne and other nearby colonies. crops grown in large quantities such as tobacco are known as

A Cash Crop

Explanation:

A cash crop or profit crop is an agricultural crop which is grown to sell for profit. It is typically purchased by parties separate from a farm. The term is used to differentiate marketed crops from subsistence crops, which are those fed to the producer's own livestock or grown as food for the producer's family. In earlier times cash crops were usually only a small (but vital) part of a farm's total yield, while today, especially in developed countries, almost all crops are mainly grown for revenue.

6 units. ab and lo are congruent sides, and if ab= 6 units, then lo would be the same.