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Verified Answer :

\(\sqrt{100}=10\ \ (c.)\ \ because\ 10^2=100\)

Well think what number when multiplied by itself = 100.

50x50=2500 so it has to be 10.

However, -x-=+ so -10x-10 is also 100.

Therefore 10 and -10 are the square roots of 100, so a and c.