Answer:
Option C: 
Step-by-step explanation:
Given the side length of a square is 11 units.
Note that 
Since, length cannot be negative, we can eliminate - 11.
Hence, the length of the side of the square is 11 units =
.
Hence, the answer.
To perform a operation with the same variable (L), add or subtract the coefficients before the variable and keep the variable.
4.8 L + 12.6 L
(4.8 + 12.6) L
17.4L
Answer: 17.4 L.
The original height of the tree is 60 m
I am pretty sure it is 82!!!