Question

Find the 19th term of an a.p -11, -15, -19......
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Answer 1

Answer:

a= -11

d= -11 - (-15)

= -11 + 15

= 4

a19= a+ 18 d

= -11 + 18 (4)

= -11+ 72

= 61

hope it's help you

Answer 2

Answer:

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Explanation:

a=-11

d= A2-A1 = -15+11=-4

A19= A+(n-1)d

A19= -11+(19-1)-4

A19= -11-72= -83

So, the 19th term at the A.P will be -83.