2 years ago

. Find the 20th term of the arithmetic sequence 15, 9, 3, -3

Mathematics

1 answer:

vova2212 [387]2 years ago

3 0

Answer:

a20 = -99

Step-by-step explanation:

hello :

the nth term in this arithmetic sequence is : an = a1 + (n -1 )d

a1 = 15 a2 = 9 d = a2-a1 = 9-15 = -6 ( common difrence)

an = 15 + (n -1 )(-6)

an = 15+6-6n

an = -6n+21

the 20th term when n = 20 : a20 = -6(20)+21 = -99

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