Which of the following are NOT allowable operations when the…

Which of the following are NOT allowable operations when the Gaussian elimination method is used to solve a system of linear equations?(i) A multiple of elements of one row may be added to the corresponding elements of any other row.(ii) Any two columns may be interchanged.(iii) All elements of any row may be squared.(iv) All of the elements of any row may be multiplied by any nonzero number.

Suppose y=x2+12x+6 and enter the appropriate values below. O…

Suppose y=x2+12x+6 and enter the appropriate values below. Only enter the number. The y-value of the y-intercept is y=[BLANK-1]. The y-value of the vertex is y=[BLANK-2]. The x-value of the vertex is x=[BLANK-3]. The axis of symmetry is x=[BLANK-4]. When x=2, y=[BLANK-5].