Who invented math and what was he/she purpose in inventing math?

Two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: what is the approximate distance, in feet, between the two poles? 6.93 feet 8.66 feet 12.32 feet 15.59 feet

Graph the line y=4/3 x+1 . use the line tool and select two points on the line.

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)