What are the two branches of geography?

What is the missing step in solving the inequality 5 - 8x < 2x + 3?

All of the following statements about the biosphere are true except: a. light and heat from the sun do not affect the biosphere. b. the biosphere gets resources from earth's crust, hydrosphere and atmosphere. c. like "biology", the name for the biosphere comes from the greek word for life. d. the biosphere includes all living organisms on earth's surface.

Solve for r in the formula v = ir, when i = 5 and v = 15.