If AC is the perpendicular bisector of BD and BD is the perpendicular bisector of AC, then how is triangle APB congruent to triangle CPB?

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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?

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?