Simplify the expression. Write the answer using scientific notation.

(2 * 10^13) ^-2

A.-4*10^-26

B. 0.25 * 10^-26

C. 2.5*10^-27

D. 2.5*10^-26

Find the sum. Enter your answer in lowest terms in the box below as a fraction, using the slash mark (7) for the fraction bar. 7/20 3/9 Answer here

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