Find the sum 2n^3 +4n^2-7 and -n^3-8n-2

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Question 3 (essay worth 10 points) (03.06 mc) part a: max rented a motorbike at $465 for 5 days. if he rents the same motorbike for a week, he has to pay a total rent of $625. write an equation in the standard form to represent the total rent (y) that max has to pay for renting the motorbike for x days. (4 points) part b: write the equation obtained in part a using function notation. (2 points) part c: describe the steps to graph the equation obtained above on the coordinate axes. mention the labels on the axes and the intervals. (4 points)

Which shows the graph of the solution set of 3y – 2x > –18?