Reason number 1 (before) is that you could contaminate your samples if you have foreign material on your hands.
Reason number 2 (after) is that you could spread<span>/or ingest dangerous chemicals or substances that you have handled in the lab.</span>
Answer:

Step-by-step explanation:
The question is poorly formatted. The original question is:

We have:

Open bracket


Express 8 as 2^3



Express 2^3 as 8

Expand each exponent

Split



Factorize

Answer:
$45
Step-by-step explanation: