Use x=1+r, where r is the interest rate paid each year. Write a model polynomial, C(x), that represents the final amount of an 8-year investment if $500 was deposited at the beginning of the first year, $800 was deposited at the beginning of the fourth year, and an additional $370 was deposited at the beginning of the eighth year.
C(x)=500x^8+800x^5+370x
C(x)=500x+800x^5+370x^8
C(x)=500x^8+800x^4+370x
C(x)=500x^8+800x^4+370
C(x)=500x^8+800x^4+370
The correct model polynomial is:
C(x) = 500x^8 + 800x^5 + 370x