Me on algebra it may look easy but to me it is hard

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

Which statement about perfect cubes is true

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