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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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I NEED HELP
creativ13 [48]

Answer:

1).  (x - 4 = 13)

2).  (r + 17 = 51)

3). (7/9x =28)

4). (2/3x = 2)

5). { 3(x-2) = -9 }

6). (x -1.75 = 8.85)

7). Natalie buys organic almonds priced at $77 from the grocery store. How much did

she pay the cashier, if she received $23 in change?

Step-by-step explanation:

1. add 4 on both sides and it will be x=17

2. subtract 17 on both sides and it will be x= 34

3. multiply 9/7 on both sides and it will be x= 257/7 then you divide 257 by 7 then the final answer will be x= 36

4. multiply 3/2 on both sides and it will be x=6/2 then you divide 6 from 2 and the finial answer will be x= 3

5. you will distribute 3 into x and 2 and you will be 3x-6=-9 then you will add 6 on both sides so you will get 3x=3 and then divide 3 on both side so you will get x=1

6. add 1.75 on both sides so x= 10.6

7. the equation will be 23 +x = 77 so first you will subtract 23 on both sides and x will equal 54 so Natalie paid $54

6 0
3 years ago
Read 2 more answers
Calculate the percent decrease 34,000 2,720
Alekssandra [29.7K]
Take 2,720/34,000=.0806. This means that 2,720 is 8.06% of the original number. In order to find the percentage of decrease, you take 100%-8.06%, which equals 91.94%. Your answer is 91.94%.
7 0
3 years ago
Find the nonpermissible replacement for x in<br> this expression.<br> X-4/X-8
vitfil [10]

Answer:

8.

Step-by-step explanation:

x cannot be 8 because that would make the denominator zero.

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3 years ago
What is the measure of ∠DEG? A) 133° B) 103° C) 77° D) 67°
Lesechka [4]
77° is the answer to your question
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3 years ago
10 &gt; c + 5 what does c =
Fittoniya [83]

Answer:

c=1

Step-by-step explanation:

8 0
4 years ago
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