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marishachu [46]
3 years ago
5

What is the sum of the geometric sequence -3, 18, -108, ... if there are 8 terms

Mathematics
1 answer:
creativ13 [48]3 years ago
6 0

Answer:

Step-by-step explanation:

common ratio=18/-3=-108/18=-6, a=-3

sn=a(r^n-1)(r-1)

sn=-3((-6)^n-1)(-6-1)

sn=-3(-6)^8-1)/(-7)

s8=-3(1679615)/(-7)

s8=719836

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3. The sum of three consecutive integers is 1,623.
TiliK225 [7]

Answer:

540, 541, 542

Step-by-step explanation:

let the number be n

hence the 3 consecutive numbers may be expressed as:

n , n+1, n+2

it is given that the sum of the 3 numbers is 1623

hence,

n + (n+1) + (n+2) = 1623

n + n + 1 + n + 2 = 1623

3n + 3 = 1623

3n = 1623 -3

3n = 1620

n = 1620 / 3

n = 540

hence the numbers are

540, (540 + 1) , (540 + 2)

or

540, 541, 542

8 0
3 years ago
Read 2 more answers
Linda has 25 students in her class, and she wants each student to have 3 ice-cream sandwiches. If there are 15 sandwiches in a b
Alchen [17]
Each must have 3
3 times number of studnets=popsicles she must buy
3 times 25=75
she needs 75 posicles

number of poples bought=number per box times number of boxes
needs 75
75=15 times number of box
divide both sides by 15
5=number of boxes


should buy 5 boxes
5 0
3 years ago
Rewrite the function and isolate Y​
hodyreva [135]
Y=2x-4

You add 8x to both sides
Making it
4y=8x-16
Then you divide both sides by 4
Making it
y=2x-4
5 0
3 years ago
Answer for 25 points
rusak2 [61]

Answer:

think its 4 and 6

Step-by-step explanation:

Please open each section so i can answer

7 0
3 years ago
I need help on this problem I have 6 minutes left to solve this!.”
Elenna [48]
The answer is 6
Hope this helps :)
4 0
3 years ago
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