Jamie purchased a dvd that was on sale for 15% off. the sales tax in her county is 5%. let y represent the original price of the dvd. write an expression that can be used to determine the final cost of the dvd.
a)0.05(0.85y)
b)y − 0.85y + 0.05y
c) 1.05(0.85y)

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this