B={x|x is an even whole no less than 9}
Now

Answer:
Using Matlab code for Fourier series to calculate for the function, see the attached
Step-by-step explanation:
Go through the picture step by step.
Answer:3^2=9
U are gonna times 3 two times
Example:3x3=9
I’m not sure how to explain it but the answer is B
Answer: n=c-d
Step-by-step explanation: n+d=c so n=c-d