Hey there!
To find the height of Liza in inches only, first convert 4 ft to inches.
Knowing that one foot is 12 inches long, you can multiply 4 ft by 12 to find 4 ft in inches:
4*12=48
Now that you have converted 4 feet to 48 inches, add the 6 inches to it to get that Liza's height in inches is 54 inches.
Hope this helps and have a wonderful day! :)