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
.
Step-by-step explanation:
3x-47=65
3x=65+47
3x=112
x=37.3
number 1 is wrong instead of 15 its 25, number 2 is correct.