yeah the answer is 1000 trees. bro because see 4km 800m = 4800 by multiply we had converted it to metres to solve the sum. then step2= we will divide it to 9.6 because it has said to have intervals and to find the intervals we need to divide as we dont know how is the length is by after the interval and after the answer will be 500 step3= then the trees are planted both sides of the roads so multiply with or by 2 and the answer is 1000 trees.