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2 years ago

What is the sum of the first 20 terms of the series below?

Mathematics

2 answers:

Evgesh-ka [11]2 years ago

7 0

the sum of the first 20 terms of the series below is C.

Natalija [7]2 years ago

6 0

Answer:

Step-by-step explanation:

Now to find the sum of first 20 terms, substitute n=20,a=−1 and d=4 in S n = 2n [2a+ (n−1)d] as follows: S 20 = 220 [(2×−1)+(20−1)4]=10[−2+(19×4)]=10(−2+76)=10×74=740 Hence, the sum of first 20 terms is 740.

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What sets of numbers does 3 over 5 belongs

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3 years ago

Read 2 more answers

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Answer:

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$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

In this problem:

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3 years ago