Use scientific notation to determine which of these numbers has the least value: 98,789,000; 987,890,000 or 89,987,000. Write your answer in scientific notation, expressed to the exact decimal place.
To determine which number has the least value, we need to convert them all into scientific notation and compare their exponents.
98,789,000 can be written as 9.8789 x 10^7
987,890,000 can be written as 9.8789 x 10^8
89,987,000 can be written as 8.9987 x 10^7
Comparing the exponents, the number with the least value is 8.9987 x 10^7, which is 89,987,000 in scientific notation.