Rectangle abcd is similar to rectangle fghi what is the value of x?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.