which data representation system is based on the digits 0-9 and is mostly easily interpreted In real wrold situations

Hexadecimal  data representation system is based on the digits 0-9 and is mostly easily interpreted In real word situations .

Explanation:

Hexadecimal manages sixteen different figures: most often the numbers 0–9 to describe values zero to nine, and (A–F) to describe values ten to fifteen. The modern hexadecimal system was first launched into the domain of computing by IBM in 1963. An older description, with 0-9 and u-z, was practiced in 1956 by the Bendix G-15 computer.

yes we can change both the color of the value of a cell as well as background color of a cell at the same time .

as we know that excel sheet consists of columns and rows.

and intersection of column and row is called cell.

we can change color of the cell and background of the cell at the same time.

hence the statement that

can a person change color of the cell and background of the cell at the same time is true.