Answer:
<u>Helium</u>
1. Helium is air
2. Helium is lighter
3. Helium can make things float
<u>Aluminum</u>
1. Aluminum is metal
2. Aluminum has a greater mass than helium
3. Aluminum can be used in many ways
Explanation:
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I think Terrorism has been a challenge for the US because there have been some serious attacks that left many people dead.
We count total cost of production by adding
Total Variable Cost + Total Fixed Cost
And we count cost per output by dividing Total cost with total output
Increase in electricity price will lead to an increase in total Fixed Cost, which will Increase overall cost per output