The graph shows the number of game systems sold since 2015. Based on this information, which function best models the number of game systems sold in millions x years since 2015?

y=21.35\left(0.7\right)^{x}
y=30.5\left(21.35\right)^{x}
y=30.5\left(1.3\right)^{x}
y=30.5\left(0.7\right)^{x}

1 answer

The function that best models the number of game systems sold in millions x years since 2015 is:

y=30.5(0.7)^x
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