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10+10 because the sum of their squares is 200, if you choose any other pair, the sum of their squares will be higher.
Answer:

Step-by-step explanation:
we know that
The total area is equal to

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substitute


Answer:
Using coal, steam, and <u>OXYGEN,</u> the fischer-tropsch procedure converts coal into a liquid fuel.
Step-by-step explanation:
A series of chemical reactions in which hydrogen and carbon monoxide converges into liquid hydrocarbons by using a metal catalyst. This process is called The Fischer-Tropsch process.
Converting Coal into Liquid Fuel is know as Coal liquification.
IN Liquification process Oxygen, heat is used.
Therefore steam is for heat and oxygen to covert coal into liquid fuel.