PLEASE HELP ME WITH ANY OF THESE QUESTIONS

Asequence of numbers begins with 12 and progresses geometrically. each number is the previous number divided by 2. which value can be used as the common ratio in an explicit formula that represents the sequence? 1/2 2 6 12

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Jane has 5 nickels.john has 3 dimes.jane says she has a greater amount of money.with the information given,is she correct?