Question

find the 10th term of AP -40, -15, 10,35....​

Answer 1

Answer:

a=-40,d=-15+40=25

T10=a+(n-1)d

T10=-40+9(25)=-40+225=185

Answer 2

Answer:

First term (a) = -40

Common difference (d) = -15 - (-40) = -15 +40 = 25

To find 10th term

We know that,

tn = a + (n - 1)d

t10 = -40 + (10 - 1 ) 25

t10 = -40 + (9) 25

t10 = -40 + 225

t10 = 185

Therefore the 10th term of the A.P is 185.

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