Answer:
the answer is the 2nd one
Step-by-step explanation:
Let the frequency be 'f' and wavelength be 'w'

, 
w= 100 m and f = 3,000 kilohertz
Plug in the above values to find k
3000 =
To find k, multiply both side by 100
3000(100) = k
k = 300,000
So equation becomes,
w= ? f = 500 kilohertz
500 =
w =
w = 600 m
The first answer is correct, if you go back by 5% each year you will see that.
Answer:
They both talk for a different amount of time