Which trig ratio uses hypotenuse and adjacent side

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Find the distance between the pair of points a(-1,8) and b(-8,4)

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?