Einstein's equations showed that matter could be converted into energy; and vice-versa
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Answer:

Explanation:
Let the distance from spotlight to wall be 15m, and distance from the man to the building be
.
#Therefore the height of the shadow as a function of the above is 
Hence, height of the shadow is expressed as s=(15-x)m
#See attached photo for illustration
One scientist proposes an idea and other scientists repeat his or her experiments so they can Accept the Idea.
50 strands is the standard procedure
The answer is either C or D.