D. 2x+3y=14 is the correct answer.
we are given

we can use vertex form parabola formula

so, we can complete x square




so, option-A........................Answer
Just work with it as seperate triangles and then add them up.
Subtract 15 from the depth:
200-15 = 185
Subtract 20 from the width ( 10 from both sides)
250-20 = 230
Area to build on: 185 x 230 = 42,550 square feet.