Final answer:
To estimate the difference of 25.92 minus five and four-tenths, subtract the whole numbers and then the decimal parts separately. The estimated difference is 20.5.
Step-by-step explanation:
To estimate the difference between 25.92 and five and four-tenths (5.4), we first round each number to the nearest whole number, since the largest place we're dealing with is in the tenths. Therefore, 25.92 is approximately 26, and 5.4 is approximately 5. The estimated difference would be 26 (rounded from 25.92) minus 5 (rounded from 5.4), which equals 21. Therefore, the closest estimate to the difference is 21. Since the options provided are more precise, we can assume the nearest tenth place might be considered in the subtraction, resulting in an answer of 20.52 if we take the hundredths place into account before rounding. Thus, the answer would be B) 20.52.