You could use another word for change can be variable witch means change and if you times the one two more times then you would get four because two time two would be four and times the one would be four.
The answer is C
6.0m x 8.0m= 48.0m
then converting it to cm by multiply
48 x 100
<span>the following element that is most reactive </span>would be Fluorine
Electronegativity
Atomic radius
Ionization energy