Kevin can travel 22 1/2 millie's in 1/3 hour. what is his average speed in miles per hour

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

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