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3. Estimate the results of the following calculations without using your calculator: (a) (3.9 x 102) (7.8 x 10-?) x (1.2 x 10) () 8.9912

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3. Estimate the results of the following calculations without using your calculator: (a) (3.9 x 102) (7.8 x 10-?) x (1.2 x 10") () 8.9912 x (3.81 x 10-4) 9.21 x 103 (7.77 x 10-2) (2.91 x 108) (1.6 x 10-192 (d) 5.51 x 10-3 12.56 x (8.85 x 10-12) (5.3 x 10-10) c)

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