Answer:
Width =9 cm
Length =6 cm
Step-by-step explanation:
Let x be width, then length is x − 3
Let area be E. Then we have: E = x ⋅ (x −3)
54= x^2-3x
x^2-3x-54=0
We then do the Discriminant of the equation:
D=9+216
D=225
X1=3+15 over 2. which is 9
X2= 3-15. over 2. which is -6 Which is declined, since we can't have negative width and length.
Therefore x is 9. So width
So width = x = 9cm and length is x-3 = 9-3cm=6 cm

1) Substitution from definition.
2) We use 
3) We are changing the order of 3 and
.
4) We add 1 and 3
and we get 
5) Substitution from definition (but the other way than at the beginning).
Answer:

Step-by-step explanation:
we know that
The length of the side, s, of a cube with a surface area, SA is equal to the formula

Step 1
Find the length of the side, s, of a cube with a surface area of 
we have

substitute in the formula


Step 2
Find the length of the side, s, of a cube with a surface area of 
we have

substitute in the formula


Step 3
Find the difference of the length sides

Answer:
How many One-sixths are in Two-thirds?
Step-by-step explanation: