City a has an elevation of 3447 feet above sea level while city b has an elevation of 86 feet below sea level. how much higher is city a than city b?

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?

How to do this , and can some one explain

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?