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(9.9×107)(5.8×106)=5.72×1013
(2.9×108)(1.3×107)=3.77×1015
(4.6×105)(2.1×104)=2.5×109
(8.8×108)(4.2×107)=13×1015
The correct response is:
(4.6×105)(2.1×104)=2.5×109