Final answer:
To find the sum of seven and twenty-five hundredths and nine and four tenths, we calculate 7.25 + 9.4 = 16.65. The result is rounded to the hundredths place.
Step-by-step explanation:
The question asks for the sum of seven and twenty-five hundredths added to nine and four tenths. The correct mathematical expression and calculation would be 7.25 + 9.4. Before rounding, the calculator shows the answer as 16.65, but we need to consider the correct number of decimal places.
Since both numbers provided in the question are specified to the nearest hundredth, the sum should also be reported to the nearest hundredth. This means we should not round off to the tenths place. Therefore, the correct calculation and sum are given by 7.25 + 9.4 = 16.65, matching option (a).