Question 823095
There are two big problems.
You really screwed up the first quarter which counts a lot and the final doesn't count much. So it won't help raise your average much.
.43*50+.43*72+.14*x=65
To get a 65 average you need  89.5714 on the final
.14x=4
x=4/.14
x=28.57
To increase by 4 points on the final, you have to improve by 28.57 on the final.