PLZ NEED OF HELP ON EXAM!!

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?