3 800 millimeters expressed in metres is​

How do i do this activity, is appreciated

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?