Answer:
18
Step-by-step explanation:
Always remember negative x negative = positive
-51-(-60)-51-(-60)
-51+60-51+60
9+9
18
I don't know what are the expressions but try yourself
Believe in yourself you can do it
<span>Indefinite pronouns may replace nouns used as subjects, predicate nouns, direct objects, indirect objects, objects of a preposition, and appositives.</span>
I don’t know sorry mansisnsiwhe sha
Answer:
or 
Step-by-step explanation:
We need to divide 300 by 20.
We get
or
.
I believe it is D, stratified random sampling.
Hope this helps!!