Answer:
C. 
Step-by-step explanation:
= Diameter of a red blood cell = 
= Diameter of a whooping cough virus = 
Ratio of the diameter of the red blood cell to the diameter of the whooping cough virus

The required ratio is
.
200 represent d and 5 represents g, so 200/5=40, the answer is 40mpg
Answer:
x=1
Step-by-step explanation:
1*5 is 5 and 4 minus 5 is -1 hope this helped :)