4.9 × 10-5 written in standard notation is 0.000049
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If the question is √490 x 10-5 = 22.1359 x 10-5 = 0.000221359 (6sf) If the question is √(490 x 10-5) = √0.0049 = 0.07 NOTE : Regarding the second answer then √(490 x 10-5) = √(49 x 10-4) = √49 x √10-4 = 7 x 10-2 = 0.07
496 = 49 x 49 x 49 x 49 x 49 x 49 = 13841287201
5 x 10-10 = 0.0000000005
2 x 10^1 x 1 x 10^5 = 2 x 10^6
49 x 10 = 490