For the following arithmetic progressions write the first term a and the common difference d :

(i)


(ii)


(iii)


(iv)

(i)


First term, a = -5


Common difference, d = -1 – (-5)


= -1 + 5 = 4


(ii)


First term, a =


Common difference, d = - =


(iii)


First term, a = 0.3


Common difference, d = 0.55 – 0.30 = 0.25


(iv)


First term, a = -1.1


Common difference, d = -3.1 – (-1.1)


= -2


1