There are 450 students, 20 teachers and 5 teacher's aides at canyon hills middle school. what is the ratio of students to teachers and their aides?
a
9: 2

b
90: 1

c
1: 18

d
18: 1

Ben and cam are scuba diving. ben is 15.815.8 meters below the surface of the water. cam is 4.24.2 meters above ben. what is cam's position relative to the surface of the water? choose 1 choose 1 (choice a) a 11.611.6 meters above the surface of the water (choice b) b 11.611.6 meters below the surface of the water (choice c) c 2020 meters above the surface of the water (choice d) d 20 meters below the surface of the water