Can someone please help me with this!! I don't know how to do this

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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)

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd