What is the sum? 3/x + 4/x(squared)

Aportion of a line bounded by two points is defined as

How is working backward similar to solving an equation?

50 people men and women were asked if they watched at least one sport on tv. 20 of the people surveyed are women, but only 9 of them watch at least one sport on tv. 16 of the men watch at least one sport on tv. make a a two-way table and a relative frequency table to represent the data.