Answer:
a₂₀ = 58
Explanation:
the nth term of an arithmetic sequence is
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
here a₁ = 1 and d = a₂ - a₁ = 4 - 1 = 3 , then
a₂₀ = 1 + (19 × 3) = 1 + 57 = 58
Answer: 58
Increment of 3
4th term is 10,
5th term is 13,
6th term is 16,
7th term is 19,
8th term is 22,
9th term is 25,
10th term is 28,
11th term is 31,
12th term is 34,
13th term is 37
14th term is 40
15th term is 43
16th term is 46
17th term is 49
18th term is 52
19th term is 55
Meaning that the 20th term is 58
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= a₁ + (n - 1)d