Question

Find: 

v) the 15the term of the AP - 40,- 15,10,35,.........

Answer 1

The given AP is  - 40,- 15, 10 , 35,.........

First term, a = -40 
Common difference, d = -15 - (-40) =25

n^th  term of the AP` a_n = a +(n-1) d =  -40 + (n-1) xx 25`

∴ 15^th  term of the AP ` a_15 = -40 + (15-1) xx 25 = -40 + 350 = 310`