A rectangular lot is bounded at the back by a river. No fence is needed along the riv and there is to be 24-ft opening in front. If the fence along the front costs $ 1.50 pe foot and along the sides $ 1 per foot, find the dimensions of the largest lot which ca be thus fenced in for $ 300. O a. . x = 121 ft and y = 84 ft O b. x = 116 ft and y = 82 ft O c. none of these O d. x = 112 ft and y = 84 ft O e. x = 122 ft and y = 84 ftFind the area of the largest rectangle that ca be inscribed in the curve 4x2 + 9y2 = 36. O a. 10 sq. units O b. none of these O c. 12 sq. units O d. 8 sq. units O e. 14 sq. units