In the given figure what value of x will make AOB a straight line? [ with step by step answer pls..]

Ineed with this problem 21 show steps

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.

In a timed typing test lara typed 63 words per minute.estimate the number of words she should be able to type in half in hour show your work