7.18 The two-element vector named pointi contains the x-coordinate and the y-coordinate of a point on the Cartesian coordinate system. Likewise for point2. Write a single R command that calculates the quantity of interest requested below. (a) Calculate the distance between the two points, where "distance" is interpreted as the Hy Euclidean distance, the distance "as the crow flies," or the Lo norm. (6) Calculate the rectilinear distance between the two points, where the "rectilinear dis- tance" is interpreted as the "Manhattan distance," "taxicab norm," or the L norm