(x/5)-6=2
It depends by difference of. Difference between is more specific.
Answer:
D) 
Step-by-step explanation:
A)

B)

C)

D)

The time taken for radio signal to the earth's surface we shall proceed as follows;
time=(distance)/(speed)
Distance=7.5×10^6 meters
speed=3×10^8 meters/second
therefore:
Time=(7.5×10^6)/(3×10^8)=0.025 seconds
We conclude that it will take the signal 0.025 seconds to reach the surface of the earth.
A mean average deviation is data used from average between the mean and each data value.