Match each verbal description to the equivalent function that fits the description.

The verbal description of the function f(t)=0.75^t/2 is as follows:
given the function, t is time, the decay constant is 1/2. This implies that the amount 0.75 decays twice after every t years. Thus the correct description is:
decay 2 times a year over a period of t years. 

Step-by-step explanation:

z=120

x=120

y+x=180

y=180-120

y=60°