Semlelllptlcal Arch Bridge An arch in the shape of the upper half of an ellipse is used to support a bridge that is to span a river 18 meters wide. The center of the arch is 3 meters above the center of the river (see the gure). Write an equation for the ellipse in which the x-axis coincides with the water level and the y-axis passes through the center of the arch. Type the left side of the enuatien below. D = 1 (Simplify your answer.) Graph the curve whose parametric equations are given and show its orientation. Find the rectangular equation of the curve. x=9cost, y=lent; Ost521: E} Choose the correct graph below. OA. Determine the rectangular equation of the curve. Choose the correct answer below. 0 x2+y2=145 O 81x+64y=1 2 O X_+i=1 31 64 2 O x_+i= Find two different parametric equations for the rectangular equation given. y=7x8 (a) Substitute x = t. FD (b) Substitute y = t. x=D