Answer:
1/4
Step-by-step explanation:
f(x) = 2 * (1/2) ^x
Let x=3
f(3) = 2 * (1/2) ^3
= 2 * ( 1/2) * 1/2) * (1/2)
= 2 * 1/8
= 2/8
= 1/4
