16-18 need help pls

CA-17 d) no solution 16 A farmer with 1000 meters of fencing wants to enclose a rectangular plot of land that borders a river. If there is no fence on the side along the river, what is the largest area that can be enclosed? 1000- 2x a) 1000000 m 2 b) 250 m2 c) 250000 m 2 d) 125000 m 2 17. Solve the inequality x2 - x 3 b ) - 5 c) 0 d) 3