Answer:
50% profit
Step-by-step explanation:
750-500 is 250 so that is a 50% profit/markup
Answer:
a) we know that this is convergent.
b) we know that this might not converge.
Step-by-step explanation:
Given the 
is convergent
Therefore,
(a) 
The power series 
has radius of convergence at least as big as 8. So we definitely know it converges for all x satisfying -8<x≤8. In particular for x = -3
∴ is convergent.
(b) 
-8 could be right on the edge of the interval of convergence, and so might not converge
If you are asking what x equals, it equals 2/5, but if it is something else more information is needed
