A measure of the steepness of a line

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Where is the vascular system located

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)