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(1.7 x 10^-4)(5 x 10^-5)

A)8.5 10^-9
B)8.5-10^20
C)6.7.10^-9
D)6.7-10^20

1 answer

To multiply numbers written in scientific notation, we first multiply their coefficients and then add their exponents. Therefore:

(1.7 x 10^-4)(5 x 10^-5) = (1.7 x 5) x 10^-4 x 10^-5 = 8.5 x 10^-9

So the answer is A) 8.5 10^-9.