(2.5 x 10 to the -8 power)x(9 x 10 to the -10 power)

a. 2.25 x 10 to the -18 power
b.2.25 x 10 to the -19 power
c.2.25 x 10 to the -16 power
d.2.25 x 10 to the -17 power
sorry i couldn't write exponents

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