Answer
Circumference(C) of a circle is given by:

where r is the radius and value of 
As per the given statement:
A building engineer analyzes a concrete column with a circular cross section.
The circumference of the column is
meters.
then;

Divide both sides by
we have;
9 = r
or
r = 9 meters
We have to find the area of the cross section of the column
Area of a circle is given by:

then;
meter square.
therefore, the area A of the cross section of the column is
meter square.
Answer:
rotated
Step-by-step explanation:
bc I said so
If $1 is 5%, 100% would be $1 times 100/5= $1 times 20 = $20
Answer:
V(t) = 25000 * (0.815)^t
The depreciation from year 3 to year 4 was $2503.71
Step-by-step explanation:
We can model V(t) as an exponencial function:
V(t) = Vo * (1+r)^t
Where Vo is the inicial value of the car, r is the depreciation rate and t is the amount of years.
We have that Vo = 25000, r = -18.5% = -0.185, so:
V(t) = 25000 * (1-0.185)^t
V(t) = 25000 * (0.815)^t
In year 3, we have:
V(3) = 25000 * (0.815)^3 = 13533.58
In year 4, we have:
V(4) = 25000 * (0.815)^4 = 11029.87
The depreciation from year 3 to year 4 was:
V(3) - V(4) = 13533.58 - 11029.87 = $2503.71