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Ksivusya [100]
2 years ago
7

PLEASE HELP! 25 POINTS AND BRANLIEST!!!!!! Find the sum of the series. Include each term that leads to the final sum and show th

e expression for finding that term.
The 5 is above the sigma, while the k=3 is below.
Please show work!
∑5 k=3(−2k+5)
Mathematics
1 answer:
Makovka662 [10]2 years ago
7 0

Answer:

I think the answer is -9?

Step-by-step explanation:

5

∑ -2k + 5

k=3

= [-2(3) + 5] + [-2(4) + 5] + [-2(5) + 5]

=      -1 + -3 + -5

 = -9

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Sum to n terms the series 7 +77 +777​
julia-pushkina [17]

Answer:

Step-by-step explanation:

=7 (1+11+111+1111......n)

=7/9 (9+99+999+9999....n)

=7/9 ((10-1)+(10^2-1)+(10^3-1)+....n)

=7/9 ((10+10^2+10^3...n)-(1+1+1+1.....n))

=7/9 ((10 (10^n-1)/(10-1))-n)

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3 years ago
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lesya692 [45]
Usually when you add big numbers together, you get a result of exponents involved :) answer for your question : 1.212154551 e^22
5 0
3 years ago
Write and solve a word problem in which there are 3 yellow beads for every 2 blue beads
baherus [9]

Ronald has 5 sets of three yellow beads, if there are 2 blue beads for every set, what is the total amount of blue beads?


8 0
3 years ago
What is m in 1/3m = -4
ahrayia [7]

Answer:

m=-12

Step-by-step explanation:

Let's solve your equation step-by-step.

1  / 3 m= −4

Step 1: Multiply both sides by 3.

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3 0
3 years ago
An isotope decays at a rate of -0.0049% per year. Find the half life. (show the work)
cricket20 [7]

Answer:

  14,146 years

Step-by-step explanation:

The annual multiplier is (1 -0.0049%) = 0.999951. We want to find the number of times this needs to be multiplied to make the product 1/2.

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  log(0.5)/log(0.999951) = t ≈ 14,145.514

The half-life is about 14,146 years.

7 0
3 years ago
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