Given:
The revenue function is

The cost function is

To find:
The profit function.
Solution:
We know that, the total profit P is defined as total revenue R minus total cost C.
So, the profit function is




Therefore, the profit function is
.
It is side angle side postulate
fd is congruet to db
ed is congruent to da
and vertical angles theorem
Answer:
four and two hundred ninety-two thousandths.