Pleas help me! I just got 2 more left!!

If square root x = -7, then x= -49 true or false

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?