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Ivahew [28]
3 years ago
11

Find the sum of the given arithmetic series. 14 + 28 + 42 + 56 + ... + 280

Mathematics
1 answer:
cricket20 [7]3 years ago
6 0

14 + 28 + 42 + 56 + … 280

= 14 (1 + 2 + 3 + 4 + … + 20)

= 14 × 20 × 21 / 2

= 2940

where we use the well-known identity,

\displaystyle \sum_{i=1}^ni = 1 + 2 + 3 + \cdots + n = \dfrac{n(n+1)}2

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The radius of a sphere is 1/3 ft what is the approximate volume of the sphere
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What is the gcf of 9 and 36
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3 years ago
Peter drive 320 miles in 8 hours . calculate his average speed .
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6 0
3 years ago
Read 2 more answers
A 20-person fraternity is making their weekend plans around 5 different parties in IV. Each brother will attend exactly one of t
skad [1K]

Answer:

3876

Step-by-step explanation:

Given the following :

Fraternity members = 20

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Meaning a group = 4 persons

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4 years ago
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