Determine the x intercept y=6x2-11x+3

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?

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?

What is the value of x in the equation7x+2y=48 when y=3