According to one study, the average price of a type of smartphone decreased by 15.3% from 2012 to 2013. The average price of that type of smartphone in 2012 was $391. Determine the average price of that type of smartphone in 2013.

2,160 π

step-by-step explanation:

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

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step-by-step explanation: