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oksian1 [2.3K]
4 years ago
13

What is the sum of the n terms of the series 4 + 12 + 36 + 108 + . . . ?

Mathematics
1 answer:
arlik [135]4 years ago
8 0
Sum of n terms of a geometric series is
Sn = a1 (r^n-1)/(r-1)
a1 = 1st term = 4
r = common ratio = 12/4 = 3
so, the sum is
Sn = 4 (3^n-1)/(3-1) = 2(3^n-1)
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3 years ago
5 roommates share the cost of an apartment: rent,electricity, and gas. rent costs 1800 and gas costs 150 per month. each roommat
Naddik [55]

Answer:

Electricity bill is 175

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Step-by-step explanation:

Given

Rent = 1800

Gas = 150

Each\ Roommate = 425 monthly

Number\ of\ Roommate = 5

Required

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If each roommate pays 425, then 5 roommates pay 5 * 425

Total = 5 * 425

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In other words,

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<em>Hence, the electricity bill is 175</em>

4 0
3 years ago
Maths<br> Share £72 in the ratio 2:7
avanturin [10]
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5 0
3 years ago
A cube with a side of 1m was sawn into cubes with a side of 1 cm and then laid in a row (in a straight line). What was the lengt
MrRissso [65]

Answer:

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Step-by-step explanation:

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2 years ago
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