Find the total number of combinations of 8 objects taken 5 at a time

Need this asap if anyone can i would be very grateful. if you could show workings that would really

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

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base