O is the centre of the circle. DC is perpendicular to AB and cuts AB at E, DE=18 and AB=24 units respectively ,determine with reasons the length of AE

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens