12x²-8x-15 should be your answer
They are equal because you can measure the percentage as a decimal with a maximum of 1.
12.9986 would be the answer from a calculator but I'd say it's 12.9. Hope this helped!
Answer:
Nitrogen
Step-by-step explanation:
Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases. Hope this helped!
