What is the sum of the digits in the result of subtraction where the first number has 20 digits each 1, and the second number has 10 digits, each 2?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks

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?