What is the answers to -3+8x-5=-8

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.