Help please thank you , look at the photo

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?

Alexandra drove from michigan to colorado to visit her friend. the speed limit on the highway is 70 miles per hour. if alexandra's combined driving time for the trip was 14 hours how many miles did alejandra drive?

If angle ase measures 168 degrees, find the measure of angle dse. the figure mag not be drawn to scale