The first one pretty sure :))))
Answer:
D
Step-by-step explanation:
red blood cell = 0.000009 = 9 × 
cold virus = 0.0000003 = 3 × 
Divide diameter of red blood cell by diameter of cold virus

= 3 × 
= 3 
= 3 × 10² → D
Answer:
-8
Step-by-step explanation:
The temperature dropped 8 degree, resulting in a negative change. So the integer to represent it would be negative 8 degrees.
I think it is b I’m not sure