Answer:
highest 7/8, 0.5, -1/4, -1 1/5 lowest
Answer: m = -1
Step-by-step explanation:
18). 16:80 is the ratio but in simplest form is; 5:0
19). 36:54 is the ratio but in simplest form is; 2:3
20). 12:24 is the ratio but in simplest form is; 1:2
hope that helps:D