What is not a linear function y= x- 2, y= x+2 , y= 2x, y=x raise to the power 2

The interior angles formed by the sides of a hexagon have measures that sum to 720°. what is the measure of angle a? enter your answer in the box. m∠a= °

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image

State how many imaginary and real zeros the function has. f(x) = x3 - 20x2 + 123x - 216