Answer:
weird
Step-by-step explanation:
Answer:
Option B. 
Step-by-step explanation:
we know that
The frequency is equal to the number of cycles divided by the time
Remember that
1 cycle = 1 full wave to repeat itself
In this problem
From o to 12 seconds ------> there are 2 cycles
therefore
The frequency is equal to

Hello!,
First we now they both equal 135
There both in ()
there both addition
I hope it helped!