Question

Which is the best estimate for (2.8 times 10 Superscript 3 Baseline) (4.1 times 10 Superscript 6 Baseline) written in scientific notation?
7 times 10 Superscript 9
1.2 times 10 Superscript 10
1.5 times 10 Superscript 10
12 times 10 Superscript 18

Answer 1

(2.8 × 10^3)(4.1 × 10^6) = (2.8×4.1) × 10^(3+6) = 11.48 × 10^9 = 1.148 × 10^10 ≈ 1.2 × 10^10.

So the best choice is 1.2 × 10^10.