If a triangle has an angle greater than 90 degrees, then it is not a right triangle true or false?

Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?

X+ y = 5 ; x - y =3 solve using linear combination

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?