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3 years ago

What is the arithmetic sequence of a1=228 n=28 sn=2982

Mathematics

1 answer:

Art [367]3 years ago

3 0

Answer:

use the formula sn= n(a1+an)/2

Step-by-step explanation:

2982=28(228+an)/2

5964=28(228+an)

5964/28=228+an

213=228+an

an=-15(last term)

to find difference use formula

an = a+(n-1)d

-15=228+(28-1)d

-243=27d

d=-243/27

d=-9

arithmetic sequence can be found be keep on subtracting 9 from 228

hence the arithmetic sequence is

228, 219, 210, 201, 192, 183, 174........-15

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Vitek1552 [10]

After 3 hours, the faster car will be 75 miles ahead of the slower car.

Step-by-step explanation:

Given,

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Speed of second car = 31 miles per hour

Let,

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According to given statement;

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Dividing both sides by 25

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After 3 hours, the faster car will be 75 miles ahead of the slower car.

Keywords: subtraction, division

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Answer:

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