Final answer:
The sum of 5.8, 8.09, -13.89, -14.7, -66.09, and -66.9 is -147.69.
Step-by-step explanation:
To find the sum of 5.8, 8.09, -13.89, -14.7, -66.09, and -66.9, you can simply add all the numbers together.
5.8 + 8.09 + (-13.89) + (-14.7) + (-66.09) + (-66.9) = -147.69
So, the sum is -147.69.