Given:

To find:
The value of f(12).
Explanation:
Substituting x = 12 we get

That means,
The total cost for renting a townhouse for 12 months is $11250.
Where f(12) represents the total cost of renting a townhouse for 12 months.
Final answer:
• The value is,

• The value f(12) represents the total cost of renting a townhouse for 12 months.
That is, the total cost for 12 months is $11250.
First, you add up the lengths, 25 + 35 + 45 = 100
then, you divide by the number of objects (in this case, three)
100÷3= about 33.33
so, 33.33 is the average length of the aircraft