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mr Goodwill [35]
2 years ago
9

In an arithmetic sequence, the sum of the first n terms is s_n=n^2. find a_8

Mathematics
1 answer:
Julli [10]2 years ago
4 0

Answer:

a_{8}  = 15

Step-by-step explanation:

a_{1} + a_{2} + ..... + a_{7} + a_{8} = 8^{2} = 64

-a_{1} - a_{2} ..... - a_{7} = - 7^{2} = -49    Now add the two equations

                                 a_{8} = 64 - 49 = 15

a_{8}  = 15

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At the "cloth for you" shop, you can buy a top for £10.00 and a Bermuda trouser for £12.00. Due to a sensational sell, there is
9966 [12]

Answer:

£32 in total for the top and two trousers

Step-by-step explanation:

The price for a top In the "cloth for you" shop= £10

The price for a bermuda trouser In the "cloth for you" shop= £12

There is a 20% discount on tops

The price If I bought one top and would trouser will be

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Total = 10-2+24

Total = £32

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3 years ago
You have several options to add to your brand new car: leather seats, heated seats, sunroof, tinted windows, and back up camera.
scZoUnD [109]

Answer:

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Step-by-step explanation:

The given options are'

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4 0
3 years ago
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son4ous [18]

Just for you beautiful!


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3 years ago
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insens350 [35]

Answer:

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Step-by-step explanation:

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3 years ago
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