Which function gives the number of points awarded for a correct answe…

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490 points are awarded if answered in < 5 seconds. Each 5 seconds after, the points decrease by 20% of the previous points. [cite: 2192, 2193, 2194]

Which function gives the number of points awarded for a correct answer

x

seconds from the time the question is asked, where

x

is a multiple of

5

f (x) = 490 (0.80)^{x /5}

f (x) = 490 (0.80)^{5 x}

f (x) = 490 (0.20)^{x /5}

f (x) = 490 (0.20)^{5 x}