Helppp and explain it if you can please :)

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x