Which of the following is true of perpetual energy?

A. It is everlasting.
B. There is no perpetual energy device today.
C. A machine or device cannot produce more energy than it consumes.
D. All of the above


Answer: D

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A) Hydrogen, fluorine, and carbon B) Hydrogen, Freon, and chromium C) Helium, Freon, and chlorine D) Helium, fluorine, and chlorine

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The formula for a building area in square feet  is A=________.

Fill in the blank(s) with the appropriate word(s).

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