what is the plane?

what is the plane? What is the good thing of travelling by plane? 1.---What is _______ plane? what‘s a plane 还是what's the plane? 一道GRE数学题in the xy-plane what is the slope of the line whose 几道sat数学题1,In the xy-coordinate plane what is the area of the look the plane is so() what is the expensive way to travel,by plane,by train or by ----- What’s the model plane look like? Plese what time the plane takes off. what does the model plane look like For what value of A is the plane 2x-2y+z=3 is tangent to the