The sum of 55+66 as the product of their gcf and another sum

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Which quadratic function best fits this data? x y 1 32 2 78 3 178 4 326 5 390 6 337 a. y=11.41x2+154.42x−143.9 b. y=−11.41x2+154.42x−143.9 c. y=11.41x2+154.42x+143.9 d. y=−11.41x2+154.42x+143.9

What is the difference between regular convex and concave polygons