Solve by completing the square x^2-6x=1

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Can someone me out here and the tell me the greatest common factor

Tamar is measuring the sides and angles of tuv to determine whether it is congruent to the triangle below. which pair of measurements would eliminate the possibility that the triangles are congruent