The three altitudes of δabc intersect at point f. point f is the
a) centroid.
b) circumcenter.
c) incenter.
d) orthocenter.

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.