We are given that , Elena is 56 inches tall.
Also , it is given that 100 inches = 254 centimeters
Then, by the UNITARY METHOD,
one inch = 254/100 centimeters
⇒ one inch =2.54 centimeters
Now, the height of Elena = 56 inches
Then, the height of Elena in centimeters = 56 x 2.54
The height of Elena in centimeters = 142.24