Find the arithmetic mean between:

(i) 9 and 19

(ii) 15 and -7

(iii) -16 and -8

A manufacturer of TV sets produced 6000 units in the third year and 7000 units in the seventh year. Assuming that the production increases uniformly by a fixed number every year, find the production

(i) in the first year,

(ii) in the 10^th year,

(iii) in 7 years.

A farmer buys a used for ₹180000. He pays ₹90000 in cash and agrees to pay the balance in annual instalments of ₹9000 plus 12% interest on the unpaid amount. How much did the tractor cost him?

Insert four arithmetic means between 4 and 29.

Insert three arithmetic means between 23 and 7.