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@jim_thompson5910 This is a quick question. Is the answer A?

I don't see 0.3 in f(n) = 9(0.7)^n

Yeah me neither. But could it be A though? Since this is decreasing, it would be by 30%

when n = 0, what is f(n)

and when n = 1, f(n) = ??

6.3

so what change happened from 9 to 6.3

70%

you took 70% of 9, yes

right

that means each next height is 70% of the previous height

which is why I'm thinking they meant to say 0.7 instead of 0.3

Oh ok! Thank you! It was probably a typo

yeah if it said "the ball loses 30% of its height each bounce", then it would work

since 100% - 30% = 70%