Estimate the value as a product of a single digit and a power of 10. the one with () are exponets ... 906,000,000,000 A. 9*10 (10) B. 9*10 (11) C. 9.06*10 (11) D. 9.06*10 (12)

The answer would be A. If it wasn't limited to a one digit number multiplied by a power of 10 then the answer would be 9.06*10^10, but the limitation requires a single digit leaving only the answer 9*10^10 because 10^10 = 100,000,000,000. That multiplied by 9 would give you 900,000,000,000.