To remain a member of student council, a student must attend at least Three-fourths of the activities. Joey attends 15 of the activities and remains on the student council. Which inequality represents the total amount of student council activities, a?
Three-fourths a greater-than-or-equal-to 15
Three-fourths a less-than-or-equal-to 15
Three-fourths a less-than 15
Three-fourths a greater-than 15