0.728(only 28 is recurring(0.7282828)) as a fraction

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

Michelle is planting flowers in her garden. she wants the ratio of daises to carnations to be 3 to 2. michelle wants to plant a total of 35 flowers. how many daises should she plant?

A6 ounce bottle of dressing costs $1.56 a 14 ounce bottle costs $3.36 a 20 ounce bottle costs $5.60 which has the lowest cost per ounce