Could u explain the depth for me ... I got -y but I dont know where it is ... Finally solve it

Thank you

6. A tank that is filled with water has an end that is shaped like a semiellipse with the major and minor axis shown. -6 ft (the density of water is approximately 62.4 pounds per cubic foot) @D= 62.4 lbs / poots a) Divide the end of the tank into layers at equal depth and construct an equation that models the fluid force on each layer. 8 ft By AF , = ( pressure ) ( D Area ) - ( wx depth ) ( DA ). = ( w x (- y) ) (AM. ( 16 51 - 42 + 1 - - 16 w [y 1 - y Dy. 1 b) Determine the total fluid force on the end of the tank. Fe = + 16 w9 /-34 Set a : 1 - 42 2 90 dy 9 du - - 24 dy. : 72 w 1 - ( - 3 ydy) - 8 O = 72 w WIN cale 8 = 72 x 62.4