22,469 divided by 15 long division show work

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

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 perimeter of an equilateral triangle if each side is (x+3)?