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the narrator says that the story of the universe is the story of the transformation of energy from one form to another. what do you think he means?

He means that the universe transgressed through different forms as it evolved; it could also be an analogy about the different processes the universe went through throughout the 13 trillion years to present day.

The narrator is pointing out that energy is involved in every event, and each event can be described in terms of energy.

Explanation: plato answer

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

a and b sometimes have a positive value