Can someone answering these questions..

common difference is calculated by subtracting previous term from next term

So

3) common difference = 8-4 = 4

4) common difference = 7-6.3 = 0.7

5) common difference = 500-200 = 300

pakistan's principal natural resources are arable land and water. about 25% of pakistan's agriculture accounts for about 21% [1] of gdp and employs about 43% of the labour force. in pakistan, the most agricultural province is punjab where wheat and cotton are the most grown.