<span>circumference is L=2

L=2π9=18π=18*3.14=56.52 in
Answer: </span>circumference is <span>18π or 56.52 in</span>
Answer:20.571
Step-by-step explanation:
x:y = 21: 24=7:8
8x=7y
y=8x/7
When x=18
y=8*18/7
y=20.571
Answer:
Sum of
and
is 
Option B is correct answer.
Step-by-step explanation:
We need to find sum of
and 
Finding sum of
and
:

We know that 
Replacing x^2-4

Now, taking LCM of (x+2)(x-2) and (x+2) we get (x+2)(x-2)

So, Sum of
and
is 
Option B is correct answer.
Answer:
4.5 in
Step-by-step explanation:
IT si 4.5 inches because the scale factor is 1 inch to 4 feet, and 18/4 = 4.5 inches.