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JulijaS [17]
3 years ago
12

Write the series using summation notation. 9 + 29 + 129 + …

Mathematics
1 answer:
Sveta_85 [38]3 years ago
4 0

Step-by-step explanation:

We can see that this adds by 20, then 100, and so on. Furthermore, it starts at 9, so we can write this as

∑9+20n

The 9 is because we start with 9, and we have a multiplier of 20, so we put the 20 in there as so. On the bottom of the sum notation, we should have n=1 (as when we plug that in, it's our first number) and at the top you can put a variable k as we don't know the maximum. I don't think I can put numbers at the bottom and top of the sum using the tools I have, so that's why I wrote it out

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The sum of three consecutive integers is 21 larger than twice the smallest integer. find the integers.
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Let the integers be x-1, x, x+1.

Given,

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3x = 21 + 2x - 2

x = 19

Hence, the three integers are 18, 19 and 20.
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2 years ago
What is a prime number.?
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Step-by-step explanation:

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A theater group surveyed 146 audience members after a show and found that 132 of them wanted to see the show again. Find the sta
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Answer:

0.024

Step-by-step explanation:

Sample size (n) = 146 people

The proportion (p) of people who answered that they would be interested in seeing the show again is:

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The standard error for a sample of size 'n' and proportion 'p' is:

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The standard error for the sample proportion of audience members who want to see the show again is 0.024.

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