Hey can any one tell me if 5/√5 is rational or irrational

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

With this question, the answer with the red arrow is incorrect!