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amid [387]
3 years ago
13

Match each sentence with the inequality that could represent the situation. Han got $2 from Clare, but still has less than $20.

Mai spent $2 and has less than $20. If Tyler had twice the amount of money he has, he would have less than $20. If Priya had half the money she has, she would have less than $20. x−2<20 2x<20 x+2<20 12x<20
Mathematics
1 answer:
Amanda [17]3 years ago
3 0

Answer:

x+2 < 20

Step-by-step explanation:

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The sum to infinity of a geometric series is 32.The sum of the first four terms is 30 and
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The terms in the series are

\displaystyle \sum_{n=1}^\infty ar^{n-1} = a + ar + ar^2 + ar^3 + \cdots

The series converges, so we |r|. All the terms in this particular series are known to be positive, so 0Consider the [tex]N-th partial sum of the series,

S_N = \displaystyle \sum_{n=1}^N ar^{n-1} = a + ar + ar^2 + \cdots + ar^{N-1}

Multiply both sides by r :

r S_N = ar + ar^2 + ar^3 + \cdots + ar^N

Subtracting this from S_N eliminates all the r^n terms between n=1 and n=N-1, leaving us with

(1 - r) S_N = a - ar^N \implies S_N = \dfrac{a(1-r^N)}{1-r}

As N\to\infty, the r^N term will converge to zero, and the value of the infinite series is

\displaystyle \sum_{n=1}^\infty ar^{n-1} = \lim_{n\to\infty} S_N = S = \frac a{1-r}

Now, we're given

S = \dfrac a{1-r} = 32 ~~~~ \text{ and } ~~~~ S_4 = \dfrac{a(1-r^4)}{1-r} = 30

By substitution, we have

S_4 = 32(1-r^4) = 30 \implies 1-r^4 = \dfrac{15}{16} \implies r^4 = \dfrac1{16} \implies r = \dfrac12

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S = \dfrac a{1 - \frac12} = 32 \implies a = 16

Then the sum of the first 8 terms is

S_8 = \dfrac{a(1-r^8)}{1-r} = \dfrac{16\left(1 - \frac1{2^8}\right)}{1-\frac12} = \dfrac{255}8

and the difference between this and the infinite sum is

S - S_8 = 32 - \dfrac{255}8 = \dfrac{256-255}8 = \boxed{\dfrac18}

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