Are these ratios equivalent? 1 to 2 and 8 to 16

Are these ratios equivalent
1:4 and 8:16

Listed in the table is the percentage of students who chose each kind of juice at lunchtime. use the table to determine the measure of the central angle you would draw to represent orange juice in a circle graph

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !