The ancient Greeks were very interested in number patterns. Triangular numbers are number that can be represented by a triangular array of dots, with n dots on each side. The first three triangular numbers are 1, 3, and 6.
Find the next five triangular numbers.

pls help quickly!!

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

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