Hello, thank you for taking the time to post your question!
To find the quotient of these two numbers in scientific notation, you can divide the coefficients and subtract the exponents.
First, you divide the coefficients: 6.8÷2=3.4
Next, you subtract the exponents: 10^5÷10^−23=10^(5−(−23))=10^(5+23)=10^28
Finally, you combine the results to get the answer in scientific notation: 3.4×10^28
I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)