if {1}= 1 {2,3} = 5 {4,5,6}= 15 {7,8,9,10}= 34 then whats the sum of the number in the 1000th set and whats the formula to figure it out

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

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

How can you tell when x and y are not directly proportional?