Question

5. Here are the first four terms of an arithmetic sequence: 6, 10, 14, 18..

a) First the sum of first 30 terms of the sequence.
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Answer 1

it hard too

Explanation:

it's hard also so

Answer 2

Answer: 180

an = a1 + (n - 1)d

a1 = 6 [1st term]

d = 4 [common difference]

n = 30 [30th term]

a30 = 6 + (30 - 1)*6 = 180