Hello There!
It is A. Units only.
Hope This Helps You!
Good Luck :)
- Hannah ❤
Answer: 
Explanation:
The frequency 
of an electromagnetic wave is given by the following equation:
Where:
is the speed of light in vacuum
is the frequency of red light
is the wavelength of red light
Isolating :
Finally:
Answer:
C. a small charged particle.
Explanation:
typically beta radiation emits an electron which is a small negativity charged particle.
hope it helps. :)
To find the answer, plot down the factors for every number.
12: 1, 2 ,3 ,4, 6, 12
18: 1, 2, 3, 6, 9, 18
84: 1, 2, 3, 4, 6, 7, 12
If you noticed, the number that was common to the 3 numbers, were 1, 2, 3, and 6
And 6 is the bigger number
So 6 is your GCF
Explanation:
Sorry english only. I wished I answer that
