Factor the following: x4 - 16

x4-2x2y2+y4

2x2-18x-20

5x2-50x+125

4x4+8x3+4x2

4x2+4x+1

x2+169

9x2-18x+9

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Stefano accidentally dropped his sunglasses off the edge of a canyon as he was looking down. the height, h(t), in meters (as it relates to sea level), of the sunglasses after t seconds, is shown in the table. during its descent, the pair of sunglasses passed by a climber in the canyon 6 seconds after stefano dropped them. to the nearest meter, what is difference in elevation between stefano and the climber? 166 meters 176 meters 230 meters 240 meters its b.176 i took the test 166 is wrong and 176 is correct

Ihonestly have no clue if it's each or none.