Which shows a difference of squares?

10y2 – 4x2
16y2 – x2
8x2 – 40x + 25
64x2 – 48x + 9

Solve the system by the elimination method. 3x - 2y - 7 = 0 5x + y - 3 = 0 to eliminate y, the lcm is 2. which of the following is the resulting equations? 1.3x - 2y - 7 = 0 5x + y - 3 = 0 2.3x - 2y - 7 = 0 -10x - 2y + 6 = 0 3.3x - 2y - 7 = 0 10x + 2y - 6 = 0

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?