1. The problem asks to write the number 0.0000089 in scientific notation. 2. Scientific notation expresses a number as $a \times 10^n$ where $1 \leq |a| < 10$ and $n$ is an integer. 3. To convert 0.0000089, move the decimal point to the right until only one non-zero digit remains to the left. 4. Moving the decimal 6 places right: $$0.0000089 = 8.9 \times 10^{-6}$$ 5. The exponent is negative because we moved the decimal to the right (number less than 1). 6. Final answer: $8.9 \times 10^{-6}$