Which table does not represent a function?

What two criteria are needed for triangles to be similar

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

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.