Answer:
D. 13
Step-by-step explanation:
x = 5
2 x 5 + 3 = 13
5 + 8 = 13
meaning the side length has to be 13, also.
The frequency stays the same and the wavelength decreases.
Would it be 5 ? i’m sorry i’m not very sure.
I think the answer would be 9 or 18 not really sure
