Question

Find the 40th term of the arithmetic sequence-2,1,4,7,10

Answer 1

A40=a1 +(40-1)r
in this case r is 3 beceause -2+3 will be 1 etc
a40=-2 +39*3

Answer 2

Answer:

115

Step-by-step explanation:

The n th term of an arithmetic sequence is

$a_{n}$ = 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

$a_{40}$ = - 2 + (3 × 39) = - 2 + 117 = 115