The graph of the equation y =ax^2 + bx + c has the line x = 4 as an axis of symmetry. Find b/a

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Determine the solution for mc001-1.jpeg

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?