3 years ago

F(n+1)=-0.5f(n) of the first term in the sequence is 120 what is f(5)?

1 answer:

6 0

f(5) = 0.5^(5-1)*f(1) = 0.5^4 * 120 = 7.5

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Sedbober [7]

30-24.08=5.92, 5.92/.16=37 minutes

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yaroslaw [1]

You’re going to have to make y increase in increments of 25 or 50 and your x can stay as 1234.

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malfutka [58]

The answer is 24.
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Valentin [98]

Answer:

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r-ruslan [8.4K]

$S=1+2+\cdots+(n-1)+n$

then we also have

$S=n+(n-1)+\cdots+2+1$

Pairing up the terms, we can find that

$2S=(1+n)+(2+n-1)+\cdots+(n-1+2)+(n+1)$

$2S=(n+1)+(n+1)+\cdots+(n+1)+(n+1)$

$S$ consists of $n$ terms, so there are $n$ copies of $n+1$ in the sum $2S$ . Then we find an immediate closed form for the sum:

$2S=n(n+1)\implies S=\dfrac{n(n+1)}2$

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2 years ago