Answer:
9.42
Step-by-step explanation:
According to the internet it states, The median of a triangle is a line segment joining the vertex of the triangle to the mid-point of its opposite side.
It bisects the opposite side, dividing it into two equal parts.
The median of a triangle further divides the triangle into two triangles having the same area
Your answer would be 3x^2 -9x -6
We need to construct the system of equations in order to solve that problem. Let's denote one-time membership fee with x and monthly fee with y. Then we can write that John paid x+6y=325 and Abigail paid x+9y=475. Solving the system of equations

, we find that x=25 and y=50. The monthly fee is 50 dollars.