3 years ago

Find the 5th term of the arithmetic sequence –5x + 7, x + 1, 7x – 5,...

Mathematics

1 answer:

Bingel [31]3 years ago

3 0

Answer:

19x - 17

Step-by-step explanation:

d = 7x - 5 - x - 1 = 6x - 6

7x - 5 + 6x - 6 + 6x - 6 = 19x - 17

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5. Find the sum of the first 35 terms of the arithmetic sequence when a = 5 and d = 4

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Answer:

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Step-by-step explanation:

Given:

a = 5

d = 4

To Find :

The sum of first 35 terms of the arithmetic sequence = ?

Solution:

Step 1 : finding the 35th term

$a_n = a_1 +(n-1)d$

$a_35 = 5 +(35-1)4$

$a_35 = 5 +(34)4$

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Step 2: Finding the sum of first 35 terms

$S_n = \frac{n(a_1 +a_n)}{2}$

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