Answer:
3
Step-by-step explanation:
area of square=l*b so
81=3x multiply 3x
81=9x^2
81/9=x^2
9=x^2
=x
3=x
Answer:
Well if you put -4 where x is.. you still do get the answer of 20.
So that is correct.
Step-by-step explanation:
Answer:

Step-by-step explanation:
Tan 54 = 
Where opposite = 16, Adjacent = BC
1.376 = 
BC = 16/1.376
BC = 11.62