Find the 40th term of the arithmetic sequence-2,1,4,7,10
2 answers:
A40=a1 +(40-1)r
in this case r is 3 beceause -2+3 will be 1 etc
a40=-2 +39*3
Answer:
115
Step-by-step explanation:
The n th term of an arithmetic sequence is
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
Here a₁ = - 2 and d = 10 - 7 = 7 - 4 = 3, thus
= - 2 + (3 × 39) = - 2 + 117 = 115
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