Final answer:
The number with ones, tenths, and hundredths that rounds to 4 as a whole number and 3.5 as a decimal is 3.5.
Step-by-step explanation:
The number with ones, tenths, and hundredths that rounds to the nearest whole number as 4 and to the nearest tenth as 3.5 must be between 3.45 and 3.55. However, since the number of hundredths is greater than 3, we know that the tenths digit must be rounded up to 5. Therefore, the number must be 3.5.