Answer:
1.75 × 10^17
Explanation:
(2.5 × 10^10)(7 × 10^6)
= 2.5 × 7 × 10 ^10 × 10^6
= 17.5 × 10^(10 + 6)
= 17.5 × 10^16
= 1.75 × 10^17
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