Your answer is B.
The relationship between medium temperature and speed of sound is a direct relationship: when one factor increases, the other increases as is shown in graph B. The British would choose the the time of day which would give the lowest speed of sound, because this would be easiest to break. Graph B shows that the lowest speed of sound would occur with the lowest air temperature - in the morning.
The equation that relates the voltages and the number of turns in a transformer is

where

is the voltage in the secondary coil,

is the voltage in the primary coil, and

and

are the number of turns on the secondary and primary coils.
Using the numbers, we find the ratio between the number of turns:
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
tinyurl.com/wtjfavyw
The two types of mechanical waves are longitudinal waves, and transversal waves.
Answer:
the actual answer is C i did it on usatestprep
Explanation: