What is the conditional frequency of a student who rides the bus being late to class first period?

Iam so stuck. what is the worked out answer for this question?

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90

Ratio of circumference to diameter example plz i need to now what it looks like.