What is 399,639 rounded to the nearest underlined place value

What is the value of the digit 1 in the number 13?

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

Which value would be a solution for x in the inequality 47-4x< 7