Perform the Indicated Operation $( 12 ) - ( - 9 )$

question 144

Short Answer

Perform the indicated operation. $( 12 ) - ( - 9 )$

---

Definitions:

Rio Grande River

A major river in North America, running from southwestern Colorado in the United States to the Gulf of Mexico, marking part of the border between the U.S. and Mexico.

Lewis And Clark

Explorers Meriwether Lewis and William Clark, who led the early 19th-century expedition commissioned by President Jefferson to explore the newly acquired western territory of the United States, reaching the Pacific Coast.

Western Expedition

An exploration endeavor typically aimed at discovering, mapping, and acquiring knowledge of new territories in the western regions.

Great Plains

A vast high plateau of semiarid grassland that extends across the United States, from the Mississippi River to the Rocky Mountains.