Tell whether the lines through the given points are parallel, perpendicular, or neither. (-2, 5) (1, -1) (4, -6), (-1, 4)

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

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?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).