Find a point between A(-3, 5) and B(7, 5)

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.

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?