A good way to think about mental and emotional health is like a tag team. Mental health refers to your ability to process information. Emotional health, on the other hand, refers to your ability to express feelings which are based upon the information you have processed.
Answer:
A hypothesis
Explanation:
A hypothesis is an explanation for those facts and can expierimented on.
To find the speed you multiply the wavelength and the frequency together.
wavelength = 8mm =

m = 0.008 m
frequency = 14 Hz
speed = 0.008m * 14 Hz = 0.112 m/s