What is the answer! Help! Slope perpendicular to line y = 2x/3 + 4

The clayton family’s pool has vertices at the coordinates (0, 2), (0, 5), (2, 5), (2, 6), (5, 6), (5, 1), (2, 1), and (2, 2). if each grid square has an area of 9 square feet, what is the area of the pool?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Which linear inequality is represented by the graph?