Fist one correct.
second wrong because not all heat is used for work, some of it lost to other.
third wrong because fuel burn inside is called combustion engine
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from left to right because it is used more in expressions
Answer: defeat the dragon? I think
Answer:
ketchup because all of the others are objects with certain creative functions but ketchup is just K e t c h u p.
Answer:
See the constructed 12-bit adder/subtractor from the components below
Explanation: