D because the shape match up to the question
This answer to the problem is f (x) =-15/2x^2 + 5x +C
This would be the average value of R(x) between 10 m and 50 m :

Draw six dots then a plus sign then draw seven dots and the count them and put an equal sign and however many dots. Doe the same with the other numbers
Answer:
This isn’t really a valid equation, so I’m guessing you forgot to type something.
Step-by-step explanation: