Final answer:
The correct scientific notation for 2112798817.58502 is 2.11279881758502 × 10^9, which corresponds to option a.
Step-by-step explanation:
Writing the number 2112798817.58502 in scientific notation involves expressing it as a product of a number between 1 and 10 and a power of 10. The process requires moving the decimal point in the original number to the left until only one non-zero digit remains before it.
Starting with 2112798817.58502, we move the decimal place 9 positions to the left to get 2.11279881758502. Because we moved the decimal 9 places, we multiply the number by 109 to maintain its original value. Therefore, the correct scientific notation for 2112798817.58502 is 2.11279881758502 × 109.
The correct answer from the options given is a) 2.11279881758502 × 109.