Answer:
3.77
Step-by-step explanation:
Do 13.85-9.08 and
u get 3.77
ANSWER

EXPLANATION
The frequency of a wave function refers to the number of times the graph repeats its cycle within the interval [0,2π]
We can observe explicitly from the graph that the frequency is half.
The period of the given function is 4π


Hence the frequency is half.
<u>Answer and Step-by-Step explaination:</u>
Area =Length time Width
Area= 21*21
Area=441
Do you have A picture of the line?