Answer:
I think the answer is f' (x)=v
The answer should be 2 but i really don't know so its 2
\
35+5(4-s)=2550
35+20-5s=2550
55-5s=2550
-55 -55
-5s = 2495
s = - 499
-499 + a = 4
+499 +499
a = 503
At 4 months the amount spent is equal at 1,600.
600+250x
400x
250*4=1000+600=1600
400*4=1600
