Complex numbers, simplify the following expression; 10/1+3i

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?

Acircle has a circumference of 7.850 units. what is its radius?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =