10 times a number increased by 4 is no more than 25

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

What function has a range {yly< 5}? question on picture above^