Question

At the end of fiscal year 2004, the federal debt of Country C is $278,560,125,000. What is the closest estimation of this amount? Express your answer in the form of a single digit times an integer power of 10.(1 point)
Responses

2.79 × 10^11

2.79 times 10 superscript 11 baseline

3 × 10^−11

3 times 10 superscript negative 11 baseline

2 × 10^11

2 times 10 superscript 11 baseline

3 × 10^11

Answer 1

278,560,125,000 = 2.78560125 × 10^11 ≈ 2.79 × 10^11

So the closest choice is 2.79 × 10^11.