Final answer:
The two-digit decimal with a sum of 17 for its digits and a tenths digit that is greater than the hundredths digit is 8.9. It does not require a calculator for the solution.
Step-by-step explanation:
To find the two-digit decimal where the sum of the digits is 17 and the tenths digit is greater than the hundredths digit, we need to consider the possible pairs of digits that add up to 17: (8,9), (9,8). Since the tenths digit must be greater than the hundredths digit, the only possible answer is 8.9.
This problem doesn't require a calculator for the solution. However, if we were to relate it to the principles of significant figures and rounding presented in the reference information, we could talk about the accuracy of measurements in different contexts. When rounding numbers to a specific decimal place in mathematics, it's important to note which digits are certain based on measuring tools or significant figures in the calculation, as shown by the examples provided.