Nitrogen, carbon dioxide, oxygen, and argon
Answer:C
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They were first developed in British. I know because in my school we are learning about blueprints.<span />
Answer:
-52 and 1/2 or just -52.5
Explanation:
1/3x=-18+1/2
1/3x = -36/2+1/2
1/3x = -35/2
x= -35/2 / 1/3
x= -52 and 1/2 = -52.5