Help PLEASE Shelby has a $5 gift card to an online music store. She downloads songs that cost $1.20 each. What equation models the total amount of money Shelby spends y if she downloads x songs?

y = 5x + 1.20
y = 5x + 1.20

y = -5x + 1.20
y = -5x + 1.20

y = 1.20x - 5
y = 1.20x - 5

y = 1.20x + 5

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Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x