When was the midpoint formula invented?

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents