Use x=1+r, where r is the interest rate paid each year. Write a model polynomial, C(x). Represent the final amount of a 7-year investment if $5,000 was deposited at the beginning of the first year, and $2,000 was deposited at the beginning of the third year.

Question

Use x=1+r, where r is the interest rate paid each year. Write a model polynomial, C(x). Represent the final amount of a 7-year investment if $5,000 was deposited at the beginning of the first year, and $2,000 was deposited at the beginning of the third year.

C(x)=5,000x^7+7,000x^4

C(x)=5,000x^7+2,000x^3

C(x)=5,000x^7+2,000x^4

C(x)=5,000x+2,000x^3

Answer 1

C(x)=5,000x^7+2,000(x+1)^2

Answer 2

The correct model polynomial in this case would be:

C(x)=5,000x^7+2,000x^3

This represents the final amount of a 7-year investment if $5,000 was deposited at the beginning of the first year, and $2,000 was deposited at the beginning of the third year.