at a math competition, 2 students can answer 40 questions in 1 hour at the same rate how many questions could 5 students answer in 15 min

Estimate the distance between orlando and jacksonville

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

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