Question

the 9th term of the ap -15 , -11 , -7....is

Answer 1

Answer:

17

Step-by-step explanation:

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Answer 2

Answer:

17

Step-by-step explanation:

a = - 15

n = 9

d = a₂ - a₁ = - 11 - ( - 15 ) = - 11 + 15 = 4

aₙ = ?

we know that aₙ = a + ( n - 1 ) d

so a₉ = - 15 + ( 9 - 1 ) 4

= - 15 + ( 8 ) 4

= - 15 + 32

= 17

so the  9th term of the ap -15 , -11 , -7....is 17