Answer:
72 in
Step-by-step explanation:
We know that 120 in is equal to the sum of the given height expressions.
(9x) +(7x-8) = 120
16x = 128 . . . . . . add 8 and simplify
x = 8 . . . . . . . . . . divide by 16
9x = girl's height = 9·8 = 72 . . . . inches
The height of the girl is 72 inches.
