John is trying to escape a ditch. every times he jumps 10 meters, he falls back 5 meters right after. the ditch is 19 meters long. what is the minimum number of jumps he needs to make to escape?

1 jump + 1 fall back moves him forward 10 - 5 = 5 metres

So continuing in this fashion his distance from start is:-

1 jump :- 5 metres

2 jumps :- 10 metres

- at this point he is 9 metres from escaping from the ditch so his 10 metre jump will take him out.

So the answer is 3 jumps.

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol